cancel running tests if new commit to branch is made

Signed-off-by: Sebastian Gumprich <[email protected]>

.github/workflows/ssh_hardening.yml

@@ -14,6 +14,14 @@ on:  # yamllint disable-line rule:truthy
       - 'roles/ssh_hardening/**'
       - 'molecule/ssh_hardening/**'
       - '.github/workflows/ssh_hardening.yml'
+
+concurrency:
+  group: >-
+    ${{ github.workflow }}-${{
+      github.event.pull_request.number || github.sha
+    }}
+  cancel-in-progress: true
+
 jobs:
   build:
     runs-on: ubuntu-18.04