Use GitHub Actions Marketplace "Setup Redmine" for CI

[sanak]

Changes proposed in this pull request:

• Use GitHub Actions Marketplace Setup Redmine for CI

@dkastl @smellman @mopinfish I replaced CI from my original implementation to use above Setup Redmine (hidakatsuya/action-setup-redmine@v1).

The action's good points are followings:

• Create PostgreSQL/MySQL instance inside the action (not as services (link) which can't be controlled by matrix db type).
• Generating config/database.yml process is encapsulated in the action's action.yml.
• Environment variables (RAILS_ENV=test and GOOGLE_CHROME_OPTS_ARGS=...) are set globally in action side.

As a result, .github/workflows/test.yml code lines decrease to about half (196 => 109) and there was no explicit performance down.

• Total duration:
  • Before: 4m 1s (link)
  • After: 4m 9s (link)

If there are no objections, I am thinking to use the action in other plugins' CI, so checking this PR is helpful. 🙇

[sanak]

Thanks for confirmation.

Not sure if Ubuntu 24.04 can be used already.

From the following document, it seems to be available now. https://github.com/actions/runner-images?tab=readme-ov-file#available-images

[dkastl]

Well, it seems to be tagged as beta still, so in that case let's stick with 22.04 for now, I would say.

[sanak]

Okay, thanks for confirmation! I will merge this.