[repo] Automate release process

[CodeBlanch]

Changes

• Adds a prepare-release.yml workflow which has this flow (for some selected component + version):
  • Open a PR to update CHANGELOGs and public api files (stable releases only).
  • Once that PR is merged you can reply /CreateReleaseTag on that PR and packages will be created and uploaded to NuGet and a release created. For stable releases a follow-up PR is opened to update PackageValidationBaselineVersion for the released projects.

Here's a test run: https://github.com/CodeBlanch/opentelemetry-dotnet-contrib/pull/32

If someone was so inclined, it should be possible to release from a phone now 😄

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.96%. Comparing base (71655ce) to head (d3331bf). Report is 276 commits behind head on main.

Additional details and impacted files

[](https://app.codecov.io/gh/open-telemetry/opentelemetry-dotnet-contrib/pull/1841?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) ```diff @@ Coverage Diff @@ ## main #1841 +/- ## ========================================== + Coverage 73.91% 73.96% +0.05% ========================================== Files 267 294 +27 Lines 9615 10825 +1210 ========================================== + Hits 7107 8007 +900 - Misses 2508 2818 +310 ``` | [Flag](https://app.codecov.io/gh/open-telemetry/opentelemetry-dotnet-contrib/pull/1841/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) | Coverage Δ | | |---|---|---| | [unittests-Exporter.Geneva](https://app.codecov.io/gh/open-telemetry/opentelemetry-dotnet-contrib/pull/1841/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) | 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[Kielek]

I like overall idea of releasing through GitHub pages.

Based on what I see, the whole process has to be either fully handled by new pipeline or fully in the old way.

The new way is IMO great for packages owned and released by maintainers. It works great. I see two potential things to improve:

1. Allow created end-users requests as described in https://github.com/open-telemetry/opentelemetry-dotnet-contrib/blob/f1ec716d54eaa26bb15b79fc3f3dc2d749f19c98/CONTRIBUTING.md#how-to-request-for-release-of-package and then follow the process by the automated cases. It will allow us to use automated process for packages used by non-maintainers.
2. Bulk releases as in #1636 - now, we can do it only one by one. I think that the manual way will be faster than here.