Upgrade Ruby to 4.0 via multi-stage build#171
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Bump the bundler group (#170) updated gems to versions requiring Ruby >= 3.2, but the Dockerfile was installing ruby-full via APT (Ruby 3.1 on Debian Bookworm). During docker build, bundler was silently downgrading activesupport 8.1.3 → 7.0.10 to satisfy Ruby 3.1, then COPY . . overwrote Gemfile.lock back to 8.1.3, causing Bundler::GemNotFound at runtime. - Use ruby:4.0-slim-bookworm as multi-stage source for Ruby binaries (bookworm variant ensures GLIBC compatibility with hexletbasics/base-image) - Update .rubocop.yml: plugins: instead of deprecated require:, TargetRubyVersion 4.0, disable Style/ReduceToHash (exercises intentionally use each_with_object) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
ruby-fullvia APT (Ruby 3.1 on Debian Bookworm /node:25-slim).activesupport 8.1.3 → 7.0.10to satisfy Ruby 3.1, thenCOPY . .overwroteGemfile.lockback to 8.1.3 — causingBundler::GemNotFoundat runtime.Fix:
ruby-fullwith a multi-stage build fromruby:4.0-slim-bookworm(Bookworm variant ensures GLIBC compatibility withhexletbasics/base-image).rubocop.yml:plugins:instead of deprecatedrequire:,TargetRubyVersion 4.0, disableStyle/ReduceToHash(exercises intentionally useeach_with_object)Test plan
docker buildcompletes successfully (all 41 gems installed, including activesupport 8.1.3, minitest 6.0.6)make code-lint— rubocop: 64 files, no offensesmake test— all tests pass, 0 failures🤖 Generated with Claude Code