Maintenance

[rwojsznis]

This pull request includes several updates to the CI configuration, dependencies, and documentation. The most important changes involve updating the CI matrix for Ruby and PostgreSQL versions, removing outdated Dockerfiles, and updating the CHANGELOG.md and gemspec for versioning.

CI Configuration Updates:

• Updated the CI matrix to test on Ruby versions 3.0.7, 3.1.6, and 3.2.6, and PostgreSQL versions 14, 15, and 16.
• Updated the GitHub Actions checkout version to v4 in the CI workflow.

Dependency and Docker Updates:

• Removed outdated Dockerfile-2.6.6 and Dockerfile-3.1.0. [1] [2]
• Updated docker-compose.yml to use PostgreSQL 16.4-alpine and removed Ruby service configuration.

Documentation and Versioning:

• Updated CHANGELOG.md to reflect the new version 0.2.0, adding support for Rails 7.0, 7.1, and 7.2.
• Bumped gem version to 0.2.0 in conflict_free_schema.gemspec.
• Updated README.md to correct the instructions for spinning up the PostgreSQL test dependency.

[rwojsznis]

seems like postgres 15+ will explodes on dump version mismatch 🤔

[mkrfowler]

pg_dump does not want to be working with a server version from the future -- the other way around is mostly fine.

You could use ubuntu-22.04 for a runs_on target which installs v16 by default (this will relatively soon be the target for ubuntu-latest — see actions/runner-images#10636)

Alternatively, manually installing an updated version of the PostgreSQL client libraries would help:

- name: Update postgres
  run: |
     sudo sh -c 'echo "deb [signed-by=/usr/share/postgresql-common/pgdg/apt.postgresql.org.asc] https://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
     sudo apt-get update && sudo apt-get install postgresql-client-16