There's a race condition in the h2_bundle.go of go 1.16.10 and later. The
issue https://github.com/golang/go/issues/51799 mentions that this might
be fixed in go 1.19, so we'll need to wait for that.
We make sure we build our docker images with go 1.16.9 to not run into
the issue in the wild.
To prepare for creating production docker images and uploading them to
docker hub, we want them to be built from the repository and from a
specified git commit or tag.
