Identification of outdated actions, invald syntax etc.

[mbruns91]

While trying to find a way to nicely validate #172, I came across the actionlint tool. Can be installed via homebrew and from conda-forge - did not know about it before. It's a static checker for GitHub Actions workflow files provided here. Usage is straight forward: from any repo root, you run actionlint and the tool will lint existing workflow files.

When applied on pyiron/actions I get this output:

$ actionlint
.github/workflows/codeql.yml:35:13: the runner of "github/codeql-action/init@v2" action is too old to run on GitHub Actions. update the action's version to fix this issue [action]
   |
35 |       uses: github/codeql-action/init@v2
   |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
.github/workflows/codeql.yml:40:13: the runner of "github/codeql-action/analyze@v2" action is too old to run on GitHub Actions. update the action's version to fix this issue [action]
   |
40 |       uses: github/codeql-action/analyze@v2
   |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

hinting that the the codeql action is outdated.