Make `Cask::Auditor` return a `Hash` with warnings and errors.

formula: set java.io.tmpdir

upgrade: avoid upgrading unrequested casks

workflows/tests: run brew test-bot --only-formulae.

build(deps): bump codecov from 0.2.2 to 0.2.3 in /Library/Homebrew

Fix brew test on Linux stdenv

Pass individual args explicitly to `ENV` extensions.

pr-automerge: fix variable name

pr-upload: fix for non-homebrew-core taps

Fixes #8107.

Bumps [codecov](https://github.com/codecov/codecov-ruby) from 0.2.2 to 0.2.3.
- [Release notes](https://github.com/codecov/codecov-ruby/releases)
- [Changelog](https://github.com/codecov/codecov-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/codecov/codecov-ruby/compare/v0.2.2...v0.2.3

)

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

dev-cmd/pr-*: allow to run on other taps too

Fix uninitialized constant Cask::Pkg

Co-authored-by: Jonathan Chang <jchang641@gmail.com>

bottle: fix inreplace string

dev-cmd/bump-formula-pr.rb: fix StringInreplaceExtension usage

This will avoid some duplicate steps already run by this workflow while
continuing to provide an integration test of the formula testing
formula.

pr-upload: ensure bottle and formula version match

Allow references to casks when running upgrade and outdated

Co-authored-by: Dawid Dziurla <dawidd0811@gmail.com>
Co-authored-by: Mike McQuaid <mike@mikemcquaid.com>

Unify (mostly) Homebrew code style

README.md: Add link to Homebrew blog

Add link to Homebrew Blog in CHANGELOG.md

- make `brew readall` only check Homebrew/brew syntax with no tap
  passed.
- pass specified tap to `brew readall` test for speed
- only shell out once in `FormulaInfo` test for speed

Make the Homebrew/cask and Homebrew/homebrew-core style more closely
match the rest of Homebrew.

To accomplish this:
- Run `brew cask style` to ensure we don't break style there when
  making changes or upgrading RuboCop in Homebrew/brew.
- Fix the HomepageMatchesUrl cop to better handle weird input.
- Remove the now unneeded `.rubocop_shared.yml`
- Fix the cask fixtures with `brew cask style --fix`.
- Share more style between Homebrew/brew, casks and formulae.

commands: Print cask commands

Inspired by https://github.com/Homebrew/brew/issues/8096 and https://github.com/Homebrew/brew/pull/8098

. I think the blog is an important way for regular users to keep up-to-date with Homebrew evolution, so it deserves an entry in the main docs page.

Update docs/README.md

Co-authored-by: Mike McQuaid <mike@mikemcquaid.com>