feat: Add git-ref to Release Pipeline

Update the release pipeline so it can accept a git reference, so that
we can maintain release branches. See SHIP-0038 [1].

[1] https://github.com/shipwright-io/community/blob/main/ships/0038-release-branching-backports.md

Assisted-by: Cursor
Signed-off-by: Adam Kaplan <[email protected]>

Author: adambkaplan

.github/workflows/release.yaml

@@ -9,9 +9,12 @@ on:
       tags:
         description: 'Previous tag'
         required: true
+      git-ref:
+        description: 'Git reference to check out. Use an appropriate release-v* branch name, tag, or commit SHA.'
+        required: true
+        default: 'main'
 jobs:
   release:
-    if: ${{ github.repository == 'shipwright-io/build' }}
     runs-on: ubuntu-latest
     permissions:
       id-token: write  # To be able to get OIDC ID token to sign images.
@@ -25,6 +28,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
+      with:
+        ref: ${{ github.event.inputs.git-ref }}
     - uses: ./.github/actions/setup
     - uses: sigstore/cosign-installer@v3
     - uses: azure/[email protected]
@@ -44,7 +49,7 @@ jobs:
       id: draft_release
       uses: actions/create-release@v1
       with:
-        release_name: "Shipwright Build release ${{ github.event.inputs.release }}"
+        release_name: "Shipwright Triggers release ${{ github.event.inputs.release }}"
         tag_name: ${{ github.event.inputs.release }}
         body_path: Changes.md
         draft: true