improvement: add `args` option for setting custom job arguments #302

Job	Run time
ash-ci / mix deps.get	20s
ash-ci / MIX_ENV=test mix.compile	33s
ash-ci / audit	35s
ash-ci / MIX_ENV=dev mix.compile	32s
ash-ci / mix docs	24s
ash-ci / mix dialyzer	3m 13s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix format --check-formatted	24s
ash-ci / mix credo --strict	25s
ash-ci / mix sobelow	34s
ash-ci / mix spark.cheat_sheets --check	23s
ash-ci / mix test	1m 34s
ash-ci / mix spark.formatter --check	26s
ash-ci / mix deps.unlock --check-unused	23s
ash-ci / Deploy docs to GitHub pages.	8s
ash-ci / Release	0s
	9m 54s

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