ci: use main branch ref for Homebrew/actions - #63

Cask/StanzaOrder: `pkg` stanza out of order

Cask/StanzaGrouping: stanza groups should be separated by a single empty line

Cask/StanzaOrder: `sha256` stanza out of order

Cask/StanzaGrouping: stanza groups should be separated by a single empty line

Naming/VariableName: Use snake_case for variable names.

Cask/StanzaOrder: `url` stanza out of order

Cask/StanzaOrder: `depends_on` stanza out of order

Naming/VariableName: Use snake_case for variable names.

Cask/StanzaGrouping: stanza groups should be separated by a single empty line

Layout/IndentationWidth: Use 2 (not 4) spaces for indentation.

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Unexpected input(s) 'test-bot', valid inputs are ['core', 'cask', 'debug', 'token', 'brew-gh-api-token', 'stable']