ci: cancel superseded in-progress runs on pull requests (cloudnative-pg#10887)

ci: cancel superseded in-progress runs on pull requests

Adds a top-level concurrency group keyed on workflow name and ref.
cancel-in-progress is true only for pull_request events, so pushes
to main, release branches, and scheduled runs always complete.

Closes  cloudnative-pg#10861

Signed-off-by: kavirakesh14 <kavirakesh007@gmail.com>
(cherry picked from commit 3abe533)

Author: kavirakesh14

.github/workflows/continuous-integration.yml

@@ -16,6 +16,10 @@ on:
 
 permissions: read-all
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 # set up environment variables to be used across all the jobs
 env:
   # renovate: datasource=github-releases depName=golangci/golangci-lint versioning=loose