internal/task: continue x repo tagging
internal/task: continue x repo tagging

Next step: expand the workflow with tagging tasks, currently all no-ops.

For golang/go#48523.

Change-Id: I48cb8804dc1db6c17b748b54a194e9ef64ef6bce
Reviewed-on: https://go-review.googlesource.com/c/build/+/425089
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>
Run-TryBot: Heschi Kreinick <e89ab2b172855aa0ad01c40c4d8a3535a61ac68a@google.com>
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@google.com>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Auto-Submit: Heschi Kreinick <e89ab2b172855aa0ad01c40c4d8a3535a61ac68a@google.com>

golang/build,golang/build,golang/build,golang/build