feat: Add Gitea support

[olblak]

Add gitea support

Fix #737 #523

• Add new resource gitea/release to interact with Gitea releases, where:
  • [source] can retrieve a release
  • [condition] can test if a release exist
  • [target] can create a release
• Add new resource gitea/branch to interact with Gitea branches via the API
  • [source] can retrieve a branch
  • [condition] can test if a branch exists
  • [target] creating branches won't be supported in this PR
• Add new resource gitea/tag to interact with Gitea tags via the API
  • [source] can retrieve a tag
  • [condition] can test if a tag exists
  • [target] creating tags via API won't be supported in this PR
• Add new resource pullrequest resourcegitea to interact with Gitea pullrequest via the API
• Documentation

Test

To test this pull request, you can run the following commands:

go build -o ./bin/updatecli . && ./bin/updatecli apply --config e2e/updatecli.d/success.d/gitea/

Additional Information

To avoid collision between gitea and github scm temporary directory, it now contains the service.
So github will clone repositories in /tmp/updatecli/github/... and gitea in /tmp/updatecli/gitea/...

Tradeoff

Now that I am implementing the integration with a second git service, I realize that having a specific scm resource per git service add no additional value.

Potential improvement