Update rack_dav for Ruby 3.2+, add GitHub Actions CI and RuboCop

[Copilot]

Modernizes rack_dav for Ruby 3.2+ compatibility and adds standard Ruby CI infrastructure.

Ruby 3.2+ / Rack 3.2 Compatibility

• Handle nil request bodies (Rack 3.2 returns nil instead of empty StringIO)

# Before: crashes on nil body
body = @request.body.read(8)

# After: safe navigation
body = @request.body&.read(8)

CI/CD

• Add GitHub Actions workflow testing Ruby 3.0, 3.1, 3.2, 3.3
• Add RuboCop with relaxed config for legacy codebase
• Remove obsolete Travis CI config (.travis.yml)

Housekeeping

• Gemfile: http → https
• gemspec: set required_ruby_version >= 3.0, relax dependency constraints
• Dockerfile: pin to Ruby 3.2
• Rakefile: remove obsolete RVM tasks

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• http://index.rubygems.org:80/api/v1/dependencies
  • Triggering command: /usr/local/bin/bundle bundle install (http block)
• http://index.rubygems.org:80/versions
  • Triggering command: /usr/local/bin/bundle bundle install (http block)
• http://rubygems.org:80/specs.4.8.gz
  • Triggering command: /usr/local/bin/bundle bundle install (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Update rack_dav for Ruby 3.2, add ruby typical CI, run tests and linters.

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