Release Shards 0.18.0

[straight-shoota]

Release preparation

1. Start preparing changelog and release notes
2. Publish release PR draft (Changelog for 0.18.0 shards#624)
   • It should be populated with updates to CHANGELOG.md, VERSION, and shard.yml.

Release process

Steps 4.-6. are automated via scripts/make-shards-release.sh

1. Finalize the release PR
   • Make sure all changes are mentioned in the changelog
   • Check release date
   • Build man files with the release date: $ make clean docs SOURCE_DATE_EPOCH=$(gdate -ud "YYYY-MM-DD" +"%s")
   • Un-draft the PR
2. Split off release branch (release/x.y)
3. Smoke test with test-ecosystem
   • Run Test Crystal & Shards Workflow with the release branch as shards_branch.
4. Merge the release PR
5. Tag & annotate the commit with the changelog using v<M.m.p> pattern as {version}
   • git tag -s -a -m v0.18.0 v0.18.0
   • git push --tags
6. Publish Github release (https://github.com/crystal-lang/shards/releases/new)
   • Copy the changelog section as description
7. Close milestone (https://github.com/crystal-lang/shards/milestones)

Post-release

1. Increment VERSION file to the next minor and -dev suffix
2. Update distribution-scripts (Helper script: scripts/update-shards.sh) (Update shards 0.18.0 #294)
   • Edit linux/Makefile
   • Edit omnibus/config/software/shards.rb
3. Update https://github.com/crystal-lang/crystal
   • Edit .github/workflows/win_build_portable.yml (Update shards 0.18.0 crystal#14411)
4. Submit a PR to update the homebrew formula in https://github.com/Homebrew/homebrew-core/blob/master/Formula/crystal.rb . Or do it on Crystal release.
5. Update default base version in test-ecosystem
6. Perform uncomment/todos left in the repo