refactor: zunit tests & gh-r logic (#201)

- Ability to run unit tests without Docker
- Define a Z-unit \_support/bootstrap script defining the isolated test
  environment in a temp dir via `mktemp -d`, to ensure a clean test
  environment.
- GH actions workflow now tests macOS & Windows and bumps Ubuntu to the
  latest.
- GH actions workflow leverages Homebrew to simplify installing zsh &
  zunit
- Condense Z-unit GH workflow into more organized build matrix. It
  avoids creating a new environment per test file as some test files
  only have one or two tests.
- Change or remove logic in the `setup` and `teardown` functions to
  commands which apply to type of tests being run (e.g., `gh-r` setup
  sets defualt ice `gh-r` and `nocompile`).
- Expand tests for testing `gh-r` on Linux & macOS for ensuring correct
  release selection.
- Correct GH workflow `on` conditions to avoid duplicating jobs.
- Update `gh-r` ice logic to be smarter about selecting a release for
  the current system.
- Expand linting to include the tools `shfmt`, `shellcheck`, and
  `mdformat`
- Rudimentary testing for all Zinit annexes (e.g., install with no
  errors)

|   Test   | Before | Now |
| :------: | :----: | :-: |
| annexes  |   3    | 10  |
|   gh-r   |   3    | 95  |
| plugins  |   2    |  3  |
| snippets |   4    |  4  |

<img width="841" alt="Screen Shot 2022-04-23 at 21 57 08" src="https://user-images.githubusercontent.com/10052309/164954220-123a8dc5-0399-41e3-b9cf-98b2cf599145.png">

Signed-off-by: Vladislav Doster <[email protected]>

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -1,53 +1,80 @@
-name: "🐞 Bug report"
-description: File a bug report
-labels: ["🐞 bug", "🎲 triage"]
-title: "🐞 bug: "
+name: Report a bug
+description: Report a bug that isn't caused by Zinit. If unsure, use this form
 body:
+
+  - type: markdown
+    attributes:
+      value: |
+        ## Self Check
+        - Look for similar errors in existing [GitHub Issues](https://github.com/zdharma-continuum/zinit/issues?q=is%3Aissue) (open or closed).
+        - Try reaching out on the [Gitter server](https://gitter.im/zdharma-continuum/community/) for help.
+
   - type: textarea
-    id: description
+    validations:
+      required: true
     attributes:
-      label: Issue description
-      description: What went wrong?
+      label: Describe the bug
+      description: A clear description of what the bug is.
+
+  - type: textarea
     validations:
       required: true
+    attributes:
+      label: Steps to reproduce
+      description: |
+        Steps to reproduce the problem.
+      placeholder: |
+        For example:
+        1. Enable plugin '...'
+        2. Run command '...' or try to complete command '...'
+        3. See error
 
   - type: textarea
-    id: zinit-config
     validations:
       required: true
     attributes:
-      label: zinit config
-      description: The ices you used
-      value: |
-        ```zsh
-        zinit \
-          null \
-          atclone'true' \
-          for zdharma_continuum/null
-        ```
+      label: Expected behavior
+      description: A brief description of what should happen.
+
+  - type: textarea
+    attributes:
+      label: Screenshots and recordings
+      description: |
+        If applicable, add screenshots to help explain your problem. You can also record an asciinema session: https://asciinema.org/
 
   - type: input
-    id: zinit-version
     validations:
       required: true
     attributes:
-      label: 'zinit version or commit ID'
-      description: '`git -C $ZINIT[BIN_DIR] rev-list --max-count=1 HEAD`'
-      placeholder: "7cd8768de45fb7e1f98bbe90a961674b38fa247d"
+      label: OS / Linux distribution
+      placeholder: |
+        Add output of the following command:
+        `echo "$OSTYPE $VENDOR $MACHTYPE $CPUTYPE $(uname -m -p)`
 
   - type: input
-    id: zsh-version
     validations:
       required: true
     attributes:
-      label: zsh version
-      description: "ZSH version you're currently using: `echo $ZSH_VERSION`"
-      placeholder: "5.8"
+      label: Zsh version
+      description: Run `echo $ZSH_VERSION` to check.
+      placeholder: "5.6"
 
   - type: input
-    id: host-info
     validations:
       required: true
     attributes:
-      label: host info
-      description: "`typeset -m '*TYPE'; uname --kernel-release; grep -E '^ID=|^VERSION=' /etc/os-release 2>/dev/null`"
+      label: Terminal emulator
+      placeholder: iTerm2, GNOME Terminal, Terminal.app...
+
+  - type: dropdown
+    attributes:
+      label: If using WSL on Windows, which version of WSL
+      description: Run `wsl -l -v` to check.
+      options:
+        - WSL1
+        - WSL2
+
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here. This can be themes, plugins, custom settings...

.github/ISSUE_TEMPLATE/config.yml

@@ -1,8 +1,8 @@
 blank_issues_enabled: true
 contact_links:
-  - name: ❓ GitHub Discussions
+  - name: Support
     url: https://github.com/zdharma-continuum/zinit/discussions
-    about: Please ask and answer questions here
-  - name: 💬 Gitter
+    about: Ask the community for support
+  - name: Get help on Gitter
     url: https://gitter.im/zdharma-continuum/community/
-    about: Chat with the team
+    about: Have a quick question? Join the Gitter community and ask your question.

.github/ISSUE_TEMPLATE/feature-request.yml

@@ -1,10 +1,37 @@
-name: "🎁 Feature request"
-description: Request a new feature
-labels: ["🎁 feature request", "🎲 triage"]
-title: "🎁 Feature request: "
+name: Feature request
+description: Suggest a feature for Zinit
+labels: ["Feature"]
 body:
+  - type: markdown
+    attributes:
+      value: |
+        ## Self Check
+        - Look for similar features in existing [GitHub Issues](https://github.com/zdharma-continuum/zinit/issues?q=is%3Aissue) (open or closed).
+  - type: input
+    attributes:
+      label: If the feature request is for a plugin or theme, specify it here.
+      description: The name of the plugin or theme that you would like us to improve.
+      placeholder: e.g. Git plugin, Agnoster theme
+  - type: textarea
+    attributes:
+      label: If the feature solves a problem you have, specify it here.
+      description: A description of what the problem is.
+      placeholder: Ex. I'm always frustrated when...
+  - type: textarea
+    attributes:
+      label: Describe the proposed feature.
+      description: A description of what you want to happen. Be as specific as possible.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Describe alternatives you've considered
+      description: A description of any alternative solutions or features you've considered. This can also include other plugins or themes.
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: Add any other context, screenshots or Gitter conversations about the feature request here. Also if you have any PRs related to this issue that are already open that you would like us to look at.
   - type: textarea
-    id: description
     attributes:
-      label: Feature request
-      description: Description of the usecase that's currently not supported
+      label: Related Issues
+      description: Is there any open or closed issues that is related to this feature request? If so please link them below!

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,46 @@
+<!--- Provide a general summary of your changes in the Title above -->
+
+## Description
+
+<!--- Describe your changes in detail -->
+
+## Motivation and Context
+
+<!--- Why is this change required? What problem does it solve? -->
+
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+## Usage examples
+
+<!--- Provide examples of intended usage -->
+
+```zsh
+
+```
+
+```zsh
+
+```
+
+## How Has This Been Tested?
+
+<!--- Please describe in detail how you tested your changes. -->
+
+## Types of changes
+
+<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+
+## Checklist:
+
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+
+<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
+
+- [ ] My change requires a change to the documentation.
+- [ ] I have updated the documentation accordingly.
+- [ ] I have added tests to cover my changes.
+- [ ] All new and existing tests passed.