chore(tests): add coverage for ./pkg/runner (#202)

Only changes test files.

---

- remove tests specific to running on a host with no container
  they are the same as with the containers (TestRunEventHostEnvironment)
- prefix the name of the tests with a distinctive name to
  more easily run them together
- use code.forgejo.org/oci images whereever possible
- remove some tests that are either
  - difficult to understand (ancient bugs)
  - not yet well understood (related to reusable workflows)
  - depend on github (generation of workflows to be run on the fly
    e.g. updateTestIfWorkflow)
- fix the TestSanitizeNetworkAlias tests that were not run
  and make them easier to debug
- disable tests of options that are forbidden in Forgejo Actions
  (testdata/container-hostname/push.yml)

Reviewed-on: https://code.forgejo.org/forgejo/act/pulls/202
Reviewed-by: Michael Kriese <michael.kriese@gmx.de>
Co-authored-by: Earl Warren <contact@earl-warren.org>
Co-committed-by: Earl Warren <contact@earl-warren.org>

act/model/testdata/container-volumes/push.yml

@@ -5,15 +5,14 @@ jobs:
   with-volumes:
     runs-on: ubuntu-latest
     container:
-      image: node:16-buster-slim
+      image: code.forgejo.org/oci/node:22-bookworm
       volumes:
         - my_docker_volume:/path/to/volume
         - /path/to/nonexist/directory
         - /proc/sys/kernel/random/boot_id:/current/boot_id
     steps:
       - run: |
-          set -e
+          set -ex
           test -d /path/to/volume
           test "$(cat /proc/sys/kernel/random/boot_id)" = "$(cat /current/boot_id)"
           test -d /path/to/nonexist/directory
-