docker: add new build-image step on github ci

.github/workflows/ci.yml

@@ -9,6 +9,12 @@ on:
     branches:
       - develop
       - main
+  workflow_dispatch:
+    inputs:
+      build_only:
+        description: 'Build Docker image only (skip deploy)'
+        type: boolean
+        default: true
 
 jobs:
   tests:
@@ -149,6 +155,46 @@ jobs:
       - name: Frontend Tests
         run: bun run test
 
+  build-image:
+    runs-on: ubuntu-latest
+    needs: [tests, linter]
+    if: (github.ref == 'refs/heads/main' && github.event_name == 'push') || github.event_name == 'workflow_dispatch'
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=sha,prefix=
+            type=raw,value=latest
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
   deploy:
     runs-on: ubuntu-latest
     needs: [tests, linter]