homebrew-tap

$ brew tap mulesoft-labs/tap
$ brew install aws-keycloak

Modifying formulae

Create a Release (or Tag) for your source repo. Make sure it builds!
In the formula here, update the url and sha256 with: curl -L $url | shasum -a256
Delete or comment our the bottle do block.
Make sure you don't have the formula installed already (eg. brew remove aws-keycloak)
Test with brew install --verbose --debug HomebrewFormula/aws-keycloak.rb, see that it builds as expected. (I had to try this half a dozen times before the build was clean, not sure why)
git commit, git push (merge to master), brew update
Make sure it is not installed again (eg. brew remove aws-keycloak)
Install it from your tap and build the bottle: brew install --build-bottle aws-keycloak (may need to run multiple times again).
brew bottle aws-keycloak. Copy the output into your formula, but change the root_url to some place you can actually host the file, like a github release, eg. https://github.com/mulesoft-labs/aws-keycloak/releases/download/v1.3.6/
Upload the generated tar.gz file to that location, like by attaching it to the gh release. Make sure to change the filename to get rid of the --! It should be $bin-$version.$os.bottle.tar.gz.
Make sure it is not installed again.
Test the bottle with brew install --force-bottle HomebrewFormula/aws-keycloak.rb.
If it works, commit and push!
Test by brew removeing it again, brew update, and brew install aws-keycloak. See that it uses the bottle rather than building.