- cleanup exports in CA
- remove exports from build-extra-tests CA
- put exports in build-extra-tests.sh
- based it on $GITHUB_WORKSPACE
- changed exports in run-tests CA to use $GITHUB_WORKSPACE
- in common.mk
- removed TODO comment lines where `$(sim)` had been removed
- removed commented out lines that used `$(sim)`
- removed unused debugging script1.sh
- As similar as possible to the circle ci code.
- The `.github/README.md` file has a fair amount of documentation for this.
- Creates a worfklow file
- re-uses most of the circleci/scipts unchanged
- defines a number of *Composite Actions* which are like YML subroutines
- Removes the circle-ci code
- Points the CI badge in the top level README to use the GA test result