* Update workflow dependencies
ubuntu-latest vm has been updated from 20.04 to 22.04.
To avoid sudden issues, use 22.04 explicitly.
CMake doesn't need to be updated on 22.04, but ninja must be installed separately in the simulator workflow.
actions/checkout@v2 uses deprecated Node.js 12.
Update to v3 which uses 16
Also fix issue where workflow fails on pull requests when the
user who made the pull request doesn't have the secrets set.
Also allow other workflows to be triggered manually.
Also don't trigger any workflows on pull requests to master, as
there shouldn't be any pull requests against master.
