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This fixes problems found when building a Mac version of libvvp.so for testing. A successful build can be seen attached to the source branch.
The change of runner is peculiar: it seems that github has started using ARM runners for "macos-latest" and the Homebrew build of bison seems broken. Evidence here until I purge the old logs. Look at top and bottom of the "Build, check and install" section.
Description:
Fix test.yml for Mac by fixing docopt and using Macos-12 runner.
Update the versions of called Actions to prevent warnings and add "workflow_dispatch" to allow testing.
Unrelated: add "*.so" to .gitignore to hide built libvvp.so.