Add action testing framework with test-runner and discoverable test files #12

Job	Run time
should	10s
discover-tests	4s
run-tests (gh-actions/jq/tests/basic.test.yml)	9s
run-tests (gh-actions/diskspace/tests/basic.test.yml)	7s
run-tests (gh-actions/fetch/tests/basic.test.yml)	15s
run-tests (gh-actions/bson/tests/basic.test.yml)	6s
run-tests (gh-actions/test-runner/tests/test-runner.test.yml)	7s
Action Tests	2s
	1m 0s

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