Move ascii_spec, internal_investigation to GitHub actions

[Earlopain]

The only thing left after this are the "normal" specs.

Unfortunatly GitHub doesn't support yml anchors so the matrix is duplicated. There are ways to have the matrix generated/reusable but that results in complex/unreadable actions from my experience. This ain't so bad, CircleCI didn't use/have matrix, you win some you loose some.

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I'm moving the jruby job to the different jobs. I don't see why Jurby should have its own section instead of being part of the matrix. This also should speed up green CI by a bit. JRuby does take the longest and now it can execute these in parallel if there are enough available workers.

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Before submitting the PR make sure the following are checked:

• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.

[bbatsov]

I'm moving the jruby job to the different jobs. I don't see why Jurby should have its own section instead of being part of the matrix. This also should speed up green CI by a bit. JRuby does take the longest and now it can execute these in parallel if there are enough available workers.

Good idea!

Unfortunatly GitHub doesn't support yml anchors so the matrix is duplicated. There are ways to have the matrix generated/reusable but that results in complex/unreadable actions from my experience. This ain't so bad, CircleCI didn't use/have matrix, you win some you loose some.

That's fine by me.

[Earlopain]

This seems to work quite nicely actually, the windows jobs also benefit from the split. CI went from the longest job taking ~17 minutes (jruby) to ~9minutes overall