workflows: fix docker tag

workflows/tests: handle system Linuxbrew.

GitHub Actions has started rolling out Linuxbrew to some workers so
ensure we can handle whether or not it's present.

Cleanup and move things around while we're here.

build(deps): bump rubocop from 0.81.0 to 0.82.0 in /Library/Homebrew

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.81.0 to 0.82.0.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop/compare/v0.81.0...v0.82.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

formula_cellar_checks: check for shim dir references

github: add sponsors GraphQL API

dev-cmd/audit: add --skip-style option.

This will allow `brew style` and `brew audit` to be run separately
without providing duplicates.

Additionally, run RuboCop style rules when `--strict` isn't provided and
remove a confusing reference to `style`.

test: ensure pkill is run even without exception.

This should make it easier to cleanup after test failures or successes.

It may also allow simplification of `test do` blocks if they can assume
that all subprocesses will be killed.

cli/args: fix formulae_paths.

docs: point to homebrew/install repository.

The `Pathname`s don't have `name`s to `uniq`.

shims/super/cc: allow -Werror=implicit-function-declaration

formula: add standard meson args

This saves duplicating the (un)install instructions in multiple places.

audit: add draft release detection

libdir is especially important on Fedora based distributions,
where it might default to "lib64", but everything else expects "lib",
so forcing the libdir is necessary there.

build(deps): bump parser from 2.7.1.0 to 2.7.1.1 in /Library/Homebrew

cmd/upgrade: handle nil runtime_dependencies.

Fixes #7360

Bumps [parser](https://github.com/whitequark/parser) from 2.7.1.0 to 2.7.1.1.
- [Release notes](https://github.com/whitequark/parser/releases)
- [Changelog](https://github.com/whitequark/parser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/whitequark/parser/compare/v2.7.1.0...v2.7.1.1

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

cli/args: add formulae_paths helper.

None of these made sense as end-user commands.

This makes these commands robust to invalid syntax.

This allows getting the formulae passed as arguments while not having
to read the file or raising an exception on invalid syntax.

dev-cmd/extract: instruct users to run git fetch unshallow