ci: fix: docker/build-push-action build-args syntax

.github/workflows/ci.yml

@@ -148,7 +148,9 @@ jobs:
         with:
           context: .
           file: Kemkas.Web/Composite.Dockerfile
-          build-args: FE_TAG=${{ env.GITHUB_SHA_SHORT }},BE_TAG=${{ env.GITHUB_SHA_SHORT }}
+          build-args: |
+            FE_TAG=${{ env.GITHUB_SHA_SHORT }}
+            BE_TAG=${{ env.GITHUB_SHA_SHORT }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
           push: false