add checkout to steps

.forgejo/workflows/build.yml

@@ -10,6 +10,9 @@ jobs:
   docker:
     runs-on: ubuntu-24.10
     steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
       
@@ -25,6 +28,7 @@ jobs:
       - name: Build and push
         uses: docker/build-push-action@v6
         with:
+          context: .
           platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64
           push: true
           tags: ${{ env.REGISTRY_IMAGE }}:latest