Add test.sh to run certain tests in Docker

[DavisNT]

Add ability to run build-simulator and test-format tests in Docker.

Syntax with local Docker image is:

docker run --rm -it -v ${PWD}:/sources --user $(id -u):$(id -g) infinitime-build /opt/test.sh build-simulator [repo branch]
docker run --rm -it -v ${PWD}:/sources --user $(id -u):$(id -g) infinitime-build /opt/test.sh test-format [commit]

The repo and branch parameters for build-simulator specify InfiniSim version to use for the test build. The commit parameter for test-format specify base commit/branch/tag to compare against when testing the formatting.

[github-actions[bot]]

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