Install go in build WSL distro

You may be concerned that the building environment is now polluted and
not a clean image. Worry not, for the purpose of this workflow run is
not to verify that the service builds. In this workflow, we build it
because we need it, and not to verify that it can build.

It is "QA/Build wsl-pro-service debian package" that is in charge of
verifying the package build.

tools/build/build-deb.ps1

@@ -47,9 +47,13 @@ set -eu
 
 git config --global --add safe.directory "$(pwd)"
 
-# Update internal dependencies in the repo
-# (we need git to work, and .git is not rsync'd)
+# Update internal dependencies in the repo because
+# we need git to work, and .git is not rsync'd.
 cd wsl-pro-service
+go version || (   
+    sudo DEBIAN_FRONTEND=noninteractive apt update
+    sudo DEBIAN_FRONTEND=noninteractive apt install -y golang-go
+)
 ./debian/update-internal-dependencies
 go mod tidy
 go mod vendor