ci: add parallel frontend build job to workflow

Split the single build job into two parallel jobs (build-api and
build-frontend) to enable simultaneous container builds when multiple
runners are available. Frontend images are tagged with frontend- prefix.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.gitea/workflows/build.yaml

@@ -1,4 +1,4 @@
-name: Build and Push Docker Image
+name: Build and Push Docker Images
 
 on:
   push:
@@ -9,7 +9,7 @@ on:
   workflow_dispatch:
 
 jobs:
-  build-and-push:
+  build-api:
     runs-on: ubuntu-latest
     steps:
       - name: Install dependencies
@@ -31,32 +31,24 @@ jobs:
           REPO_OWNER="${{ gitea.repository_owner }}"
           REPO_NAME="${{ gitea.repository }}"
 
-          # Extract repository name without owner
           REPO_NAME_ONLY=$(echo "$REPO_NAME" | cut -d'/' -f2)
-
-          # Convert to lowercase for Docker registry compatibility
           REPO_OWNER_LOWER=$(echo "$REPO_OWNER" | tr '[:upper:]' '[:lower:]')
           REPO_NAME_LOWER=$(echo "$REPO_NAME_ONLY" | tr '[:upper:]' '[:lower:]')
 
-          # Base image path
           IMAGE_BASE="${REGISTRY}/${REPO_OWNER_LOWER}/${REPO_NAME_LOWER}"
 
-          # Determine tag based on ref
           case "${{ gitea.ref }}" in
             refs/tags/*)
-              # Tag push - use the tag name
               TAG_NAME="${{ gitea.ref_name }}"
               echo "IMAGE_TAG=${IMAGE_BASE}:${TAG_NAME}" >> $GITHUB_OUTPUT
               echo "PUSH_LATEST=true" >> $GITHUB_OUTPUT
               ;;
             refs/heads/main)
-              # Main branch - use commit SHA (shortened to 7 chars) and latest
               SHORT_SHA=$(echo "${{ gitea.sha }}" | cut -c1-7)
               echo "IMAGE_TAG=${IMAGE_BASE}:${SHORT_SHA}" >> $GITHUB_OUTPUT
               echo "PUSH_LATEST=true" >> $GITHUB_OUTPUT
               ;;
             *)
-              # Other branches - use branch name
               BRANCH_TAG=$(echo "${{ gitea.ref_name }}" | sed 's/\//-/g')
               echo "IMAGE_TAG=${IMAGE_BASE}:${BRANCH_TAG}" >> $GITHUB_OUTPUT
               echo "PUSH_LATEST=false" >> $GITHUB_OUTPUT
@@ -70,13 +62,13 @@ jobs:
         run: |
           echo "${{ secrets.PERSONAL_TOKEN }}" | docker login gitea.leeworks.dev -u "${{ gitea.actor }}" --password-stdin
 
-      - name: Build and push with Docker
+      - name: Build and push API image
         shell: sh
         run: |
-          echo "Building image..."
+          echo "Building API image..."
           docker build -t ${{ steps.tags.outputs.IMAGE_TAG }} .
 
-          echo "Pushing image..."
+          echo "Pushing API image..."
           docker push ${{ steps.tags.outputs.IMAGE_TAG }}
 
           if [ "${{ steps.tags.outputs.PUSH_LATEST }}" = "true" ]; then
@@ -85,5 +77,74 @@ jobs:
             docker push ${{ steps.tags.outputs.IMAGE_LATEST }}
           fi
 
-          echo "Build and push completed successfully!"
-          echo "Image available at ${{ steps.tags.outputs.IMAGE_TAG }}"
+          echo "API image available at ${{ steps.tags.outputs.IMAGE_TAG }}"
+
+  build-frontend:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install dependencies
+        shell: sh
+        run: |
+          apk add --no-cache git docker-cli
+
+      - name: Checkout code
+        shell: sh
+        run: |
+          git clone https://gitea.leeworks.dev/${{ gitea.repository }}.git .
+          git checkout ${{ gitea.sha }}
+
+      - name: Determine image tags
+        id: tags
+        shell: sh
+        run: |
+          REGISTRY="gitea.leeworks.dev"
+          REPO_OWNER="${{ gitea.repository_owner }}"
+          REPO_NAME="${{ gitea.repository }}"
+
+          REPO_NAME_ONLY=$(echo "$REPO_NAME" | cut -d'/' -f2)
+          REPO_OWNER_LOWER=$(echo "$REPO_OWNER" | tr '[:upper:]' '[:lower:]')
+          REPO_NAME_LOWER=$(echo "$REPO_NAME_ONLY" | tr '[:upper:]' '[:lower:]')
+
+          IMAGE_BASE="${REGISTRY}/${REPO_OWNER_LOWER}/${REPO_NAME_LOWER}"
+
+          case "${{ gitea.ref }}" in
+            refs/tags/*)
+              TAG_NAME="${{ gitea.ref_name }}"
+              echo "IMAGE_TAG=${IMAGE_BASE}:frontend-${TAG_NAME}" >> $GITHUB_OUTPUT
+              echo "PUSH_LATEST=true" >> $GITHUB_OUTPUT
+              ;;
+            refs/heads/main)
+              SHORT_SHA=$(echo "${{ gitea.sha }}" | cut -c1-7)
+              echo "IMAGE_TAG=${IMAGE_BASE}:frontend-${SHORT_SHA}" >> $GITHUB_OUTPUT
+              echo "PUSH_LATEST=true" >> $GITHUB_OUTPUT
+              ;;
+            *)
+              BRANCH_TAG=$(echo "${{ gitea.ref_name }}" | sed 's/\//-/g')
+              echo "IMAGE_TAG=${IMAGE_BASE}:frontend-${BRANCH_TAG}" >> $GITHUB_OUTPUT
+              echo "PUSH_LATEST=false" >> $GITHUB_OUTPUT
+              ;;
+          esac
+
+          echo "IMAGE_LATEST=${IMAGE_BASE}:frontend-latest" >> $GITHUB_OUTPUT
+
+      - name: Login to registry
+        shell: sh
+        run: |
+          echo "${{ secrets.PERSONAL_TOKEN }}" | docker login gitea.leeworks.dev -u "${{ gitea.actor }}" --password-stdin
+
+      - name: Build and push frontend image
+        shell: sh
+        run: |
+          echo "Building frontend image..."
+          docker build -t ${{ steps.tags.outputs.IMAGE_TAG }} ./frontend
+
+          echo "Pushing frontend image..."
+          docker push ${{ steps.tags.outputs.IMAGE_TAG }}
+
+          if [ "${{ steps.tags.outputs.PUSH_LATEST }}" = "true" ]; then
+            echo "Tagging and pushing frontend-latest..."
+            docker tag ${{ steps.tags.outputs.IMAGE_TAG }} ${{ steps.tags.outputs.IMAGE_LATEST }}
+            docker push ${{ steps.tags.outputs.IMAGE_LATEST }}
+          fi
+
+          echo "Frontend image available at ${{ steps.tags.outputs.IMAGE_TAG }}"