Cancel superseded pull request validation without cancelling releases

.gitea/workflows/build-and-push.yml

@@ -3,19 +3,26 @@ name: Build and Push Container
 on:
   push:
     branches:
-      - master
     - main
     tags:
     - v*
-  workflow_dispatch:
+  workflow_dispatch: null
+  pull_request:
+    branches:
+    - main
 
 env:
   REGISTRY: gitea.wayfinderak.com
   IMAGE_NAME: wayfinderak/prepbot
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.event.pull_request.number
+    || github.run_id }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   docker:
-    runs-on: ubuntu-latest
+    runs-on: butler-ci
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -39,7 +46,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Log in to Gitea registry
-        if: ${{ steps.delivery.outputs.run == 'true' }}
+        if: ${{ (steps.delivery.outputs.run == 'true') && github.event_name != 'pull_request' }}
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
@@ -74,6 +81,6 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           context: .
-          push: true
+          push: ${{ github.event_name != 'pull_request' }}
           platforms: linux/amd64,linux/arm64
           tags: ${{ steps.prep.outputs.tags }}