ci: cancel stale Go Tests runs on force-push

Add concurrency group to the Go Tests workflow so that a new push to
the same branch (or PR update) automatically cancels any in-progress
run for the previous commit. Without this, force-pushing a PR branch
accumulates multiple parallel Go Tests runs that hold runners and
produce stale results.

Signed-off-by: Mikhail Malyshev <mike.malyshev@gmail.com>

Author: rucoder

.github/workflows/go-tests.yml

@@ -22,6 +22,10 @@ on:  # yamllint disable-line rule:truthy
       - '**/*.md'
       - '.github/**'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   test:
     runs-on: jumbo