Adds homebrew bump automation

[codefromthecrypt]

This helps us complete patch releases since Envoy aren't actually doing
it, yet.

See envoyproxy/envoy#17500

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[mathetake]

Awesome💯

[codefromthecrypt]

I needed to add this below here:

          download-url: https://github.com/envoyproxy/envoy/archive/${{ github.event.inputs.tag-name }}.tar.gz

[codefromthecrypt]

This won't work until either the automation can handle git tags or envoy's formula doesn't rely on git.

Thanks to @cho-m for troubleshooting

Homebrew/homebrew-core#83921 (comment)

Here's the change needed to the envoy formula (using revision instead of a tag.gz sha)

  # TODO: We can't use the tar.gz archive URL, which means bump-homebrew-formula-action doesn't work. See #83921
  url "https://github.com/envoyproxy/envoy.git",
     tag:      "v1.19.1",
     revision: "a2a1e3eed4214a38608ec223859fcfa8fb679b14"

[carlocab]

You might want to try https://github.com/dawidd6/action-homebrew-bump-formula -- I think this one doesn't choke on formulae that use Git tags + revisions.

[codefromthecrypt]

Thanks, I will switch it and use it next time (next month I suppose would be when another round of patches land)

[codefromthecrypt]

https://github.com/marketplace/actions/homebrew-bump-formula as also mentioned, which maybe the same as the prior!