Use GitHub Actions for CI

[GoebelL]

Summary Use GitHub Actions for CI and publish related test reports.

Acceptance criteria

• [X] Unit tests of repo projects (oscm, oscm-app, oscm-rest-api, etc.) are running with GitHub Action
• [X] Test failures are indicated with respective code places in a user-friendly manner
• [X] Test reports for the master trunk are published in build failure as well as in success case
• [X] Comprehensive code coverage reports for the master trunk are published in build failure as well as in success case

Additional context N/A

[GoebelL]

Completed with pull requests: https://github.com/servicecatalog/oscm/pull/1270 https://github.com/servicecatalog/oscm/pull/1267 https://github.com/servicecatalog/oscm/pull/1269 https://github.com/servicecatalog/oscm-app/pull/127 https://github.com/servicecatalog/oscm-app/pull/129 https://github.com/servicecatalog/oscm-app/pull/130 https://github.com/servicecatalog/oscm-app/pull/131 https://github.com/servicecatalog/oscm-identity/pull/101 https://github.com/servicecatalog/oscm-identity/pull/102 https://github.com/servicecatalog/oscm-approval/pull/68 https://github.com/servicecatalog/oscm-mail/pull/10 https://github.com/servicecatalog/oscm-mail/pull/12 https://github.com/servicecatalog/oscm-mail/pull/13 https://github.com/servicecatalog/oscm-commons/pull/51 https://github.com/servicecatalog/oscm-rest-api/pull/256 https://github.com/servicecatalog/oscm-rest-api/pull/257 https://github.com/servicecatalog/oscm-rest-api/pull/258 https://github.com/servicecatalog/oscm-rest-api/pull/259 https://github.com/servicecatalog/oscm-rest-api/pull/260 https://github.com/servicecatalog/oscm-rest-api/pull/262 https://github.com/servicecatalog/oscm-rest-api/pull/266 https://github.com/servicecatalog/oscm-rest-api/pull/267

[GoebelL]

Done.