feat(ci): Add a bunch of boilerplate automation goodies

.github/nextdoor.yml

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+slackChannel: "#kingpin"

.github/release-drafter.yml

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+name-template: v$RESOLVED_VERSION
+tag-template: 'v$RESOLVED_VERSION'
+tag-prefix: 'v'
+categories:
+  - title: '🚀 Features'
+    labels:
+      - 'feature'
+      - 'enhancement'
+  - title: '🐛 Bug Fixes'
+    labels:
+      - 'fix'
+      - 'bugfix'
+      - 'bug'
+  - title: '🧰 Maintenance'
+    label: 'chore'
+change-template: '- $TITLE @$AUTHOR (#$NUMBER)'
+change-title-escapes: '\<*_&' # You can add # and @ to disable mentions, and add ` to disable code blocks.
+template: |
+  ## Changes
+
+  $CHANGES

.github/workflows/prlint.yml

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+name: pull-request-lint
+on:
+  pull_request:
+    types:
+      - edited
+      - labeled
+      - opened
+      - ready_for_review
+      - reopened
+      - synchronize
+    branches-ignore:
+      - production
+jobs:
+  validate:
+    name: Validate PR title
+    runs-on:
+      - runs-on=${{ github.run_id }}
+      - runner=1cpu-linux-arm64
+      - extras=s3-cache
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      # Magic Cache
+      - uses: runs-on/action@v1
+
+      # Check out the repo so that we can dynamically discover the available charts in the repo.
+      - name: Checkout
+        uses: actions/checkout@v4
+      # Verify the PR title against the "types" and "scopes" we allow.
+      #
+      # https://github.com/amannn/action-semantic-pull-request#configuration
+      - uses: amannn/[email protected]
+        id: lint_pr_title
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          requireScope: true
+          types: |
+            chore
+            docs
+            feat
+            fix
+            refactor
+            test
+          scopes: |
+            deps
+            docs
+            ci
+            actors
+            aws
+            s3
+            iam
+            cfn
+            cloudformation
+            group
+            macro
+      - uses: marocchino/sticky-pull-request-comment@v2
+        if: always() && (steps.lint_pr_title.outputs.error_message != null)
+        with:
+          header: pr-title-lint-error
+          message: |
+            Hey there and thank you for opening this pull request! 👋🏼
+
+            We have changed the repository requirements to now use [Conventional Commits specification](https://www.conventionalcommits.org/en/v1.0.0/) and it looks like your proposed title needs to be adjusted.
+
+            Details:
+
+            ```
+            ${{ steps.lint_pr_title.outputs.error_message }}
+            ```
+      # Delete a previous comment when the issue has been resolved
+      - if: ${{ steps.lint_pr_title.outputs.error_message == null }}
+        uses: marocchino/sticky-pull-request-comment@v2
+        with:
+          header: pr-title-lint-error
+          delete: true

.github/workflows/release_drafter.yml

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+name: release-drafter
+on:
+  push:
+    branches:
+      - main
+jobs:
+  drafter:
+    uses: Nextdoor/.github/.github/workflows/release-drafter.yml@main
+    secrets: inherit

.github/workflows/stale.yml

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+# https://github.com/marketplace/actions/stale-branches
+name: Stale Branches
+
+on:
+  workflow_dispatch: {}
+  schedule:
+    - cron: '0 6 * * 1-5'
+
+permissions:
+  issues: write
+  contents: write
+  pull-requests: write
+
+jobs:
+  stale_branches:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Stale Branches
+        uses: crs-k/[email protected]
+        with:
+          days-before-stale: 21
+          days-before-delete: 28
+          tag-committer: true
+          branches-filter-regex: '^((?!dependabot|production))'

renovate.json

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended",
+    ":prHourlyLimitNone",
+    ":prConcurrentLimitNone",
+    ":automergePr",
+    ":automergePatch",
+    ":automergeRequireAllStatusChecks"
+  ],
+  "automerge": true,
+  "automergeType": "pr",
+  "platformAutomerge": true,
+  "schedule": [
+    "before 5am on monday"
+  ],
+  "packageRules": [
+    {
+      "matchUpdateTypes": [ "patch", "minor" ],
+      "automerge": true
+    },
+    {
+      "enabled": false,
+      "matchDatasources": [ "docker" ],
+      "matchPackageNames": [ "library/" ]
+    }
+  ]
+}