Externalize and update onboarding instructions (flutter#154730)

Part 1/n flutter#154724 

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [ ] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

---------

Co-authored-by: Tirth <[email protected]>
Co-authored-by: Navaron Bracke <[email protected]>

Author: 3 people

dev/conductor/README.md

@@ -4,14 +4,14 @@ Command-line tool for managing a release of the Flutter SDK. Also see
 [Release Process](../../docs/releases/Release-process.md) for more information on
 the release process.
 
-## Requirements
+## Conductor Requirements
 
-Some basic requirements to conduct a release are:
+Some basic requirements to run conductor are:
 
 - a Linux or macOS computer set up for Flutter development. The conductor does
   not support Windows.
 - git
-- Mirrors on GitHub of the Flutter
+- Mirrors on GitHub of the Flutter **
   [framework](https://github.com/flutter/flutter) and
   [engine](https://github.com/flutter/engine) repositories.
 
@@ -23,6 +23,8 @@ unlock your ssh key for the session; if you do not, each time the conductor
 attempts to interact with a remote, the user will be prompted to enter their ssh
 key password.
 
+** Confirm that your personal github clone of flutter/flutter is named flutter and flutter/engine is named engine. If not you will need to use flags to override the defaults.
+
 ## Usage
 
 The main entrypoint for the conductor is [bin/conductor](bin/conductor). For
@@ -40,8 +42,6 @@ conductor start \
   --candidate-branch=flutter-2.2-candidate.10 \
   --release-channel=beta \
   --github-username=kingOfDevelopers \
-  --engine-cherrypicks=72114dafe28c8700f1d5d629c6ae9d34172ba395 \
-  --framework-cherrypicks=a3e66b396746f6581b2b7efd1b0d0f0074215128,d8d853436206e86f416236b930e97779b143a100 \
   --dart-revision=4511eb2a779a612d9d6b2012123575013e0aef12 \
 ```
 
@@ -77,26 +77,6 @@ step with the command:
 
 `conductor next`
 
-### Apply Engine Cherrypicks
-
-The tool will attempt to auto-apply all engine cherrypicks. However, any
-cherrypicks that result in a merge conflict will be reverted and it is left to
-the user to manually cherry-pick them (with the command `git cherry-pick
-$REVISION`) and resolve the merge conflict in their checkout.
-
-Once a PR is opened, the user must validate CI builds. If there are regressions
-(or if the `licenses_check` fails, then
-`//engine/ci/licenses_golden/licenses_third_party` must be updated to match the
-output of the failing test), then the user must fix these tests in their local
-checkout and push their changes again.
-
-### Apply Framework Cherrypicks
-
-The tool will attempt to auto-apply all framework cherrypicks. However, any
-cherrypicks that result in a merge conflict will be reverted and it is left to
-the user to manually cherry-pick them (with the command `git cherry-pick
-$REVISION`) and resolve the merge conflict in their checkout.
-
 ### Publish Version
 
 This step will add a version git tag to the final Framework commit and push it

dev/conductor/RELEASE_ONBOARDING.md

@@ -0,0 +1,62 @@
+# Release engineer/manager onboarding
+
+Googler facing documentation can be found at go/flutter-release-workflow.
+
+### Responsiblity
+
+Release engineer is responsible for:
+* Branch alignment and/or Sheparding cherry picks
+* Decision making related to cherry pick risk
+* Verification that pre and post submits pass prior to publishing
+* Contributor facing communication
+* Some public facing post release comunication
+
+In the past (and possibly in the future) there was a distinction between a release engineer and release manager.
+For now the responsiblitys are the same and we will refer to the person managing the release as a release engineer.
+
+## Onboarding
+One time setup instructions for new or returning relase engineers.
+
+### Groups/Permissions
+
+#### Join flutter-hackers on github
+https://github.com/orgs/flutter/teams/flutter-hackers/members
+
+#### [Googler only] Join mdb/flutter-infra
+Possibly not required
+https://ganpati2.corp.google.com/propose_membership?parent=9147533327&child=$me.prod
+
+#### Join the flutter-announce google group
+Ping any current release engineer to add you as an owner and give you publish access.
+https://groups.google.com/g/flutter-announce/members?q=role:owner&pli=1
+
+TODO include screenshot
+
+#### [Googler only] Install tool-proxy-client
+From a glinux machine run
+`sudo apt install tool-proxy-client`
+
+`tool-proxy-client` is the tool that enables/enforces 2 party authorization for controlled builds.
+
+#### [Googler only] Confirm access to release calendar
+Public and Beta releases and timelines
+go/dash-team-releases
+
+#### [Googler only] Join release chatroom
+Release hotline https://chat.google.com/room/AAAA6RKcK2k?cls=7
+
+#### [Googler only] join mdb/flutter-release-team
+Controls who can approve 2 party auth requests.
+https://ganpati2.corp.google.com/propose_membership?parent=100213927583&child=$me.prod
+
+#### Setup conductor
+Conductor is a dart command line interface for common release tasks.
+Its instructions are in README.md.
+
+
+#### [Googler only] Confirm access to Apple signing cert update doc
+go/flutter-signing-apple-contracts
+Also confirm access to valentine entries listed in that doc.
+
+#### [Googler only] Access release engineer doc
+Confirm access to go/release-eng-retros