SHIP-0038: Release Branch Workflows

.github/workflows/release-branch.yml

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+# Reusable release brancher workflow
+# See SHIP-0038: https://github.com/shipwright-io/community/pull/194
+name: Release Brancher
+on:
+  workflow_call:
+    inputs:
+      release-version:
+        required: true
+        type: string
+      git-ref:
+        required: false
+        type: string
+jobs:
+  release-brancher:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        ref: ${{ inputs.git-ref }}
+    - name: Create release branch
+      env:
+        RELEASE_VERSION: release-${{ inputs.release-version }}
+      run: |
+        git switch -c "${RELEASE_VERSION}"
+        git push --set-upstream origin "${RELEASE_VERSION}"

workflow-templates/release-branch.properties.json

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+{
+    "name": "Release Brancher",
+    "description": "Starter workflow for creating release branches",
+    "iconName": "octicon git-branch",
+    "categories": [
+        "Automation"
+    ]
+}

workflow-templates/release-branch.yml

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+# Release branch starter workflow
+# See SHIP-0038: https://github.com/shipwright-io/community/pull/194
+name: Create Release Branch
+on:
+  workflow_dispatch:
+    inputs:
+      release-version:
+        required: true
+        type: string
+        description: "Semantic version for the release branch (vX.Y format)"
+      git-ref:
+        required: true
+        type: string
+        description: "Git ref to create the release branch from (defaults to main)"
+        default: "main"
+jobs:
+  create-release-branch:
+    permissions:
+      contents: write
+    uses: shipwright-io/.github/.github/workflows/release-branch.yml@main
+    with:
+      release-version: ${{ inputs.release-version }}
+      git-ref: ${{ inputs.git-ref }}