Consolidate CI jobs into a single workflow

[dan-manges]

No description provided.

[kylekthompson]

We made this change a while back to make the scripts easier to write. Do we need to change those?

[kylekthompson]

Specifically, they grep for version: oldversion so if more than one binary ends up having the same version, we'll change the wrong lines

[kylekthompson]

e.g.:

homebrew-tap/bin/update-captain-formulae

Line 54 in 31d99af

sed -i '' -e "s/version: \"${oldVersion}\"/version: \"${newVersion}\"/" "./.github/workflows/captain-ci.yml"

[kylekthompson]

Maybe we could change the matrix includes to be something like {name: "abq@1", version: "1.6.3"} instead of the YAML shorthand hash syntax and then include the binary name in the sed? (not 100% sure if that works)