Add dev branch support to build workflow

dev push  → :dev + :<sha>
main push → :latest + :<sha>
tag push  → :latest + :<sha> + :<version>

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.forgejo/workflows/build.yml

@@ -1,7 +1,6 @@
-# Runs on pushes to main and on version tags (v*).
+# Branch push (dev):    builds and pushes :dev + :<sha>
-#
+# Branch push (main):   builds and pushes :latest + :<sha>
-# Branch push (main):  builds and pushes :latest + :<sha>
+# Tag push (v1.2.0):    builds and pushes :latest + :<sha> + :v1.2.0
-# Tag push (v1.2.0):   builds and pushes :latest + :<sha> + :v1.2.0
 #
 # To cut a versioned release:
 #   git tag v1.2.0 && git push origin v1.2.0
@@ -13,7 +12,7 @@ name: Build & push image
 
 on:
   push:
-    branches: [main]
+    branches: [main, dev]
     tags: ["v*"]
     paths:
       - "src/**"
@@ -38,10 +37,13 @@ jobs:
       - name: Generate image tags
         id: tags
         run: |
-          TAGS="${{ env.IMAGE }}:latest,${{ env.IMAGE }}:${{ github.sha }}"
+          TAGS="${{ env.IMAGE }}:${{ github.sha }}"
-          if [[ "${{ github.ref }}" == refs/tags/* ]]; then
+          if [[ "${{ github.ref }}" == "refs/heads/main" ]]; then
-            TAGS="$TAGS,${{ env.IMAGE }}:${{ github.ref_name }}"
+            TAGS="$TAGS,${{ env.IMAGE }}:latest"
-            echo "Releasing version ${{ github.ref_name }}"
+          elif [[ "${{ github.ref }}" == "refs/heads/dev" ]]; then
+            TAGS="$TAGS,${{ env.IMAGE }}:dev"
+          elif [[ "${{ github.ref }}" == refs/tags/* ]]; then
+            TAGS="$TAGS,${{ env.IMAGE }}:latest,${{ env.IMAGE }}:${{ github.ref_name }}"
           fi
           echo "value=$TAGS" >> $GITHUB_OUTPUT