Apply a handful of changes to reduce the diff between the two:
* Cancel running jobs on new pushes
* Enable log color and backtraces
* Add timeouts
* Specify CI runner versions
* Add an armv7 job
* Replace the name NO_STD with BUILD_ONLY
* Update the extension to the canonical .yaml
* Set AR_ and CC_ environments in docker
* Install requirements to build MPFR
* Expand wasm32 testing on CI
Run the full `run.sh` test script to get full assertions, including that
nothing in the wasm compiler-builtins is panicking. Unfortunately it's
currently panicking, so this is good to weed out!
* Update libm