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/runner/testdata/path-handling/push.yml

@@ -4,12 +4,12 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: https://data.forgejo.org/actions/checkout@v3
 
       - name: "Append to $GITHUB_PATH"
         run: |
           echo "/opt/hostedtoolcache/node/18.99/x64/bin" >> $GITHUB_PATH
- 
+
       - name: test path (after setup)
         run: |
           if ! echo "$PATH" |grep "/opt/hostedtoolcache/node/18.*/\(x64\|arm64\)/bin" ; then
@@ -27,7 +27,7 @@ jobs:
             exit 1
           fi
 
-      - uses: nektos/act-test-actions/composite@main
+      - uses: https://code.forgejo.org/forgejo/act-test-actions/composite@main
         with:
           input: some input