Prefix all environment variables with PUMA_

[cafedomancer]

Description

Add PUMA_ fix to all the puma specific environment variables in preparation for Puma 6 release.

Close #2853.

List of all environment variables in Puma codebase

• puma
  • PUMA_BUNDLER_PRUNED
  • PUMA_DEBUG
  • PUMA_LOG_CONFIG
  • PUMA_NO_RUBOCOP
  • PUMA_DISABLE_SSL (formerly DISABLE_SSL)
  • PUMA_MAKE_WARNINGS_INTO_ERRORS (formerly MAKE_WARNINGS_INTO_ERRORS)
  • PUMA_WAIT_FOR_LESS_BUSY_WORKERS (formerly WAIT_FOR_LESS_BUSY_WORKERS)
  • commit_info
• systemd
  • LISTEN_FDS
  • LISTEN_PID
  • NOTIFY_SOCKET
  • WATCHDOG_USEC
• rack, rails
  • APP_ENV
  • RACK_ENV
  • RAILS_ENV
• ruby, rubygems, bundler
  • BUNDLE_APP_CONFIG
  • BUNDLE_GEMFILE
  • GEM_HOME
  • RUBYOPT
• heroku
  • PUMA_MAX_THREADS, MAX_THREADS
  • PUMA_MIN_THREADS, MIN_THREADS
  • WEB_CONCURRENCY
• others
  • CI
  • DYNO
  • GITHUB_ACTIONS
  • GITHUB_REPOSITORY
  • PORT
  • PWD
  • RAND
  • REDIS_URL
  • TEST_CASE_TIMEOUT

Your checklist for this pull request

• I have reviewed the guidelines for contributing to this repository.
• I have added (or updated) appropriate tests if this PR fixes a bug or adds a feature.
• My pull request is 100 lines added/removed or less so that it can be easily reviewed.
• If this PR doesn't need tests (docs change), I added [ci skip] to the title of the PR.
• If this closes any issues, I have added "Closes #issue" to the PR description or my commit messages.
• I have updated the documentation accordingly.
• All new and existing tests passed, including Rubocop.

[nateberkopec]

@dentarg @MSP-Greg see note in the PR about all the variables we have, LMK if you think any others should be converted.

[dentarg]

Looks good to me

I'll note there's also LISTEN_PID for systemd (and these all seem to be standard names so they should not be prefixed)

[cafedomancer]

I'll note there's also LISTEN_PID for systemd (and these all seem to be standard names so they should not be prefixed)

Thank you. Added LISTEN_PID to the list.