ci: create gh action to create cherry-pick PRs for releases (#7621)

## **Description**

This PR adds a GItHub action that makes it easy to provide the:
- Base Branch (generally a release branch)
- Commit Hash (hash to be cherry picked)
- PR Number Associated with Commit 

This enables developers, QA and release support staff an easy way to
create cherry picked PRs for releases.

## **Related issues**

NA

## **Manual testing steps**

1. Pull the PR down
2. Run the `scripts/create-cherry-pick-pr.sh` with the correct args
3. The PR will be created

## **Screenshots/Recordings**

NA

### **Before**

<!-- [screenshots/recordings] -->

### **After**

<!-- [screenshots/recordings] -->

## **Pre-merge author checklist**

- [x] I’ve followed [MetaMask Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've clearly explained what problem this PR is solving and how it
is solved.
- [x] I've linked related issues
- [x] I've included manual testing steps
- [x] I've included screenshots/recordings if applicable
- [x] I’ve included tests if applicable
- [x] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.
- [x] I’ve properly set the pull request status:
  - [x] In case it's not yet "ready for review", I've set it to "draft".
- [x] In case it's "ready for review", I've changed it from "draft" to
"non-draft".

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

---------

Co-authored-by: Cal Leung <cleun007@gmail.com>

.github/workflows/create-cherry-pick-pr.yml

@@ -0,0 +1,31 @@
+name: Cherry Pick Commit
+
+on:
+  workflow_dispatch:
+    inputs:
+      branch_name:
+        description: 'Branch name you want the cherry-pick branch to be based from'     
+        required: true
+      commit_hash:
+        description: 'Commit Hash'     
+        required: true
+      PR_number:
+        description: 'PR # Associated with Cherry Pick'     
+        required: true
+
+
+jobs:
+  cherry-pick:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Create Cherry Pick PR
+      id: create-cherry-pick-pr
+      shell: bash
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      run: |
+        ./scripts/create-cherry-pick-pr.sh ${{ github.event.inputs.branch_name }} ${{ github.event.inputs.commit_hash }} ${{ github.event.inputs.PR_number }}

scripts/create-cherry-pick-pr.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+
+set -e
+set -u
+set -o pipefail
+
+# Takes in 3 args
+# - 1 - Base PR Branch Name
+# - 2 - Commit Hash
+# - 3 - PR Number
+
+BASE_PR_BRANCH_NAME="${1}"
+COMMIT_HASH_TO_CHERRY_PICK="${2}"
+PR_BRANCH_NAME="chore/cherry-pick-${3}"
+PR_TITLE="chore: cherry-pick #${3}"
+PR_BODY="This PR cherry-picks #${3}"
+
+git config user.name metamaskbot
+git config user.email metamaskbot@users.noreply.github.com
+
+git checkout "${BASE_PR_BRANCH_NAME}"
+git pull
+git checkout -b "${PR_BRANCH_NAME}"
+git cherry-pick "${COMMIT_HASH_TO_CHERRY_PICK}"
+
+git push --set-upstream origin "${PR_BRANCH_NAME}"
+
+gh pr create \
+  --draft \
+  --title "${PR_TITLE}" \
+  --body "${PR_BODY}" \
+  --head "${BASE_PR_BRANCH_NAME}"