workflows: Add actions/checkout tag workaround

See actions/checkout#697

Author: martinpitt

.github/workflows/tests.yml

@@ -27,6 +27,9 @@ jobs:
           # need this to also fetch tags
           fetch-depth: 0
 
+      - name: Workaround for https://github.com/actions/checkout/pull/697
+        run: git fetch --force origin $(git describe --tags):refs/tags/$(git describe --tags)
+
       - name: Run unit tests
         run: |
           dpkg -s podman docker || true