Update Docker workflow to restrict branch triggers and clarify tag outputs for app, API, and Strapi builds

Author: upayanmazumder

.github/workflows/docker-build-push.yml

@@ -3,7 +3,7 @@ name: Build & Push Docker Images to GHCR
 on:
   push:
     branches:
-      - "**"
+      - main
   workflow_dispatch:
 
 permissions:
@@ -35,11 +35,11 @@ jobs:
           BRANCH_LOWER="${GITHUB_REF_NAME,,}"
 
           if [ "$BRANCH_LOWER" = "main" ]; then
-            echo "TAGS=ghcr.io/$REPO_LOWER/app:latest,ghcr.io/$REPO_LOWER/app:$GITHUB_SHA" >> $GITHUB_OUTPUT
+            echo "TAGS_APP=ghcr.io/$REPO_LOWER/app:latest,ghcr.io/$REPO_LOWER/app:$GITHUB_SHA" >> $GITHUB_OUTPUT
             echo "TAGS_API=ghcr.io/$REPO_LOWER/api:latest,ghcr.io/$REPO_LOWER/api:$GITHUB_SHA" >> $GITHUB_OUTPUT
             echo "TAGS_STRAPI=ghcr.io/$REPO_LOWER/strapi:latest,ghcr.io/$REPO_LOWER/strapi:$GITHUB_SHA" >> $GITHUB_OUTPUT
           else
-            echo "TAGS=ghcr.io/$REPO_LOWER/app:$BRANCH_LOWER,ghcr.io/$REPO_LOWER/app:$GITHUB_SHA" >> $GITHUB_OUTPUT
+            echo "TAGS_APP=ghcr.io/$REPO_LOWER/app:$BRANCH_LOWER,ghcr.io/$REPO_LOWER/app:$GITHUB_SHA" >> $GITHUB_OUTPUT
             echo "TAGS_API=ghcr.io/$REPO_LOWER/api:$BRANCH_LOWER,ghcr.io/$REPO_LOWER/api:$GITHUB_SHA" >> $GITHUB_OUTPUT
             echo "TAGS_STRAPI=ghcr.io/$REPO_LOWER/strapi:$BRANCH_LOWER,ghcr.io/$REPO_LOWER/strapi:$GITHUB_SHA" >> $GITHUB_OUTPUT
           fi
@@ -48,22 +48,28 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: ./app
-          push: true
-          tags: ${{ steps.tags.outputs.TAGS }}
           file: ./app/Dockerfile
+          push: true
+          tags: ${{ steps.tags.outputs.TAGS_APP }}
+          cache-from: type=registry,ref=ghcr.io/${{ github.repository }}/app:latest
+          cache-to: type=inline
 
       - name: Build & Push API
         uses: docker/build-push-action@v5
         with:
           context: ./api
+          file: ./api/Dockerfile
           push: true
           tags: ${{ steps.tags.outputs.TAGS_API }}
-          file: ./api/Dockerfile
+          cache-from: type=registry,ref=ghcr.io/${{ github.repository }}/api:latest
+          cache-to: type=inline
 
       - name: Build & Push Strapi
         uses: docker/build-push-action@v5
         with:
           context: ./strapi
+          file: ./strapi/Dockerfile
           push: true
           tags: ${{ steps.tags.outputs.TAGS_STRAPI }}
-          file: ./strapi/Dockerfile
+          cache-from: type=registry,ref=ghcr.io/${{ github.repository }}/strapi:latest
+          cache-to: type=inline