Determine e2e branch based on version number

.github/workflows/custopize.yml

@@ -24,6 +24,7 @@ jobs:
  tag: ${{ env.RELEASE_TAG }}
  image-zip: ${{ env.IMAGE_ZIP }}
  image-url: ${{ env.IMAGE_URL }}
+ e2e-branch: ${{ env.E2E_BRANCH }}
  steps:
 
  - name: "⬇ Checkout"
@@ -131,6 +132,17 @@ jobs:
 
  echo "OCTOPRINT_VERSION=$OCTOPRINT_VERSION" >> $GITHUB_ENV
 
+ - name: "🔎 Determine e2e branch"
+ run: |
+ E2E_BRANCH="master"
+ if [[ "${{ env.OCTOPRINT_VERSION }}" == *"-rc"* ]]; then
+ E2E_BRANCH="maintenance"
+ fi
+
+ echo "E2E branch: $E2E_BRANCH"
+
+ echo "E2E_BRANCH=$E2E_BRANCH" >> $GITHUB_ENV
+ 
  - name: "⬇ Download OctoPi"
  id: octopi_download
  run: |
@@ -240,7 +252,7 @@ jobs:
  workflow: Test against testrig
  repo: OctoPrint/devtools
  ref: main
- inputs: '{"image": "${{ needs.build.outputs.image-url }}", "target": "pic"}'
+ inputs: '{"image": "${{ needs.build.outputs.image-url }}", "target": "pic", "e2e-branch": "${{ needs.build.outputs.e2e-branch }}"}'
  repost-logs: false
 
  deploy: