🔧 Enable dev container publishing on feature branch for testing

- Add devcontainer-updates branch to publishing trigger
- Tag images with branch name for testing
- Update integration workflow to use branch-tagged cache

Author: retlehs

.github/workflows/devcontainer.yml

@@ -2,7 +2,7 @@ name: Publish Dev Container
 
 on:
   push:
-    branches: [main]
+    branches: [main, devcontainer-updates]
     paths:
       - '.devcontainer/**'
   workflow_dispatch:
@@ -28,5 +28,6 @@ jobs:
         uses: devcontainers/[email protected]
         with:
           imageName: ghcr.io/roots/acorn-devcontainer
+          imageTag: ${{ github.ref_name }}
           cacheFrom: ghcr.io/roots/acorn-devcontainer
           push: always

.github/workflows/integration.yml

@@ -16,7 +16,7 @@ jobs:
         uses: devcontainers/[email protected]
         with:
           configFile: .devcontainer/devcontainer.json
-          cacheFrom: ghcr.io/roots/acorn-devcontainer
+          cacheFrom: ghcr.io/roots/acorn-devcontainer:${{ github.ref_name }}
           push: never
           runCmd: |
             # Wait for database to be ready