ci: fix docker image cleaning

Author: guenhter

.github/workflows/docker-build.yml

@@ -1,4 +1,4 @@
-name: Build and Push Backend Image
+name: Build and Push Images
 
 on:
   push:
@@ -8,6 +8,15 @@ on:
 jobs:
   build-and-push:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - name: backend
+            context: backend
+            package: modai-chat-backend
+          - name: frontend
+            context: frontend_omni
+            package: modai-chat-frontend
     permissions:
       contents: read
       packages: write
@@ -28,14 +37,14 @@ jobs:
         id: meta
         uses: docker/metadata-action@v5
         with:
-          images: ghcr.io/${{ github.repository_owner }}/modai-chat-backend
+          images: ghcr.io/${{ github.repository_owner }}/${{ matrix.package }}
           tags: |
             type=raw,value=latest
 
       - name: Build and push Docker image
         uses: docker/build-push-action@v6
         with:
-          context: backend
+          context: ${{ matrix.context }}
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
@@ -46,10 +55,18 @@ jobs:
     name: Cleanup Untagged Images
     runs-on: ubuntu-latest
     needs: build-and-push
+    strategy:
+      matrix:
+        include:
+          - name: backend
+            package: modai-chat-backend
+          - name: frontend
+            package: modai-chat-frontend
     permissions:
       packages: write
     steps:
       - name: Delete untagged images
         uses: dataaxiom/ghcr-cleanup-action@v1
         with:
           delete-untagged: true
+          package: ${{ matrix.package }}