This allows for running the specs with a frozen environment that
should closely match the production environment.
This adds the following rake tasks:
* coverage: Runs specs in serial with coverage
* frozen_spec: Runs specs in serial in frozen environment
* frozen_pspec: Runs specs in parallel in frozen environment
It changes the default rake task to run both the coverage and
frozen_spec tasks. It also changes the GitHub CI workflow
to use the default rake task.
When specs are run in the frozen environment they call
clover_freeze before running the specs, after loading all
other code.
There are currently 56 specs that do not work in the frozen
environment. They are skipped by including the skip_if_frozen
method in each spec.
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