ci: run CI on pull requests #177

Job	Run time
ash-ci / audit	34s
ash-ci / mix igniter.upgrade	5s
ash-ci / mix deps.get	15s
ash-ci / MIX_ENV=test mix.compile	26s
ash-ci / MIX_ENV=dev mix.compile	22s
ash-ci / mix credo --strict	21s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix docs	1m 58s
ash-ci / mix dialyzer	3m 13s
ash-ci / mix format --check-formatted	23s
ash-ci / mix sobelow	21s
ash-ci / mix spark.cheat_sheets --check	21s
ash-ci / mix spark.formatter --check	20s
ash-ci / mix test	2m 10s
ash-ci / mix deps.unlock --check-unused	22s
ash-ci / Deploy docs to GitHub pages.	9s
ash-ci / NIF ${{ matrix.nif }} - ${{ matrix.job.target }} (${{ matrix.job.os }})	0s
ash-ci / Release	0s
	11m 20s

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