fix: Use path context when building release image

This commit configures docker/build-push-action to use path
context in order to get git-lfs working.

See docker/build-push-action#312 for
context.

.github/workflows/release.yml

@@ -48,6 +48,7 @@ jobs:
       - name: Build and push Docker image
         uses: docker/build-push-action@v4
         with:
+          context: .
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}