chore: update build and publish workflows to use root context for Docker builds

.gitea/workflows/build.yaml

@@ -25,7 +25,7 @@ jobs:
       - name: build-worker
         uses: docker/build-push-action@v5
         with:
-          context: ./worker/
+          context: .
           file: ./worker/Dockerfile
           push: false
           tags: 015-worker:test

.gitea/workflows/publish.yaml

@@ -40,7 +40,7 @@ jobs:
       - name: build-worker
         uses: docker/build-push-action@v5
         with:
-          context: ./worker/
+          context: .
           file: ./worker/Dockerfile
           push: true
           tags: ${{ steps.meta.outputs.tags }}