feat: subscription installer #1351

Job	Run time
ash-ci / audit	41s
ash-ci / mix igniter.upgrade	3s
ash-ci / mix deps.get	21s
ash-ci / MIX_ENV=test mix.compile	50s
ash-ci / mix format --check-formatted	45s
ash-ci / mix spark.cheat_sheets --check	45s
ash-ci / mix spark.formatter --check	44s
ash-ci / mix docs	2m 9s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix credo --strict	44s
ash-ci / mix dialyzer	5m 43s
ash-ci / mix sobelow	45s
ash-ci / mix test	1m 27s
ash-ci / mix deps.unlock --check-unused	54s
ash-ci / MIX_ENV=dev mix.compile	2m 8s
ash-ci / Deploy docs to GitHub pages.	0s
ash-ci / NIF ${{ matrix.nif }} - ${{ matrix.job.target }} (${{ matrix.job.os }})	0s
ash-ci / Release	0s
	17m 59s

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