ci: add reusable action for checking version

Signed-off-by: Jens Peder Meldgaard <[email protected]>

.github/workflows/unit_tests.yml

@@ -36,6 +36,7 @@ jobs:
     name: Check for changes and post bump comment
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v4
       - name: Check Version
         uses: ./.github/actions/check_version
         with: