[PLA-2420] Fix release CI

[JayPavlina]

• change default user agent to Enjin-Platform-CSharp-SDK/{version}
• set default graphql endpoint to https://platform.enjin.io/graphql
• publish upm to https://github.com/enjin/platform-unity-sdk
• use OIDC for nuget

Additional Info

This pull request makes several important improvements to the build and release automation and enhances the usability of the PlatformClient class. The main changes include consolidating and expanding CI workflows, improving the release process for both NuGet and Unity packages, and making the PlatformClient easier to use with sensible defaults.

CI/CD and Release Workflow Improvements:

• The .github/workflows/build.yml workflow was significantly enhanced to handle both NuGet and Unity Package Manager (UPM) releases, including support for manual workflow dispatches and improved artifact publishing. The workflow now uploads NuGet packages and UPM tarballs to draft releases, publishes to NuGet.org using OIDC authentication, and pushes Unity packages to a dedicated repository. A new job ensures releases are only published after all assets are attached. ([[1]](https://github.com/enjin/platform-csharp-sdk/pull/37/files#diff-5c3fa597431eda03ac3339ae6bf7f05e1a50d6fc7333679ec38e21b337cb6721L8-R24), [[2]](https://github.com/enjin/platform-csharp-sdk/pull/37/files#diff-5c3fa597431eda03ac3339ae6bf7f05e1a50d6fc7333679ec38e21b337cb6721L55-R232))
• The now-redundant .github/workflows/unity.yml workflow was deleted, consolidating all packaging and release logic into the improved build workflow. ([.github/workflows/unity.ymlL1-L104](https://github.com/enjin/platform-csharp-sdk/pull/37/files#diff-3b739592ec0b95d14f953ef27c16fa130d2a7aa4cdb5b410c64357ac161d926cL1-L104))

PlatformClient Usability Enhancements:

• The PlatformClient class now provides a DefaultBaseAddress (pointing to the Enjin Platform GraphQL endpoint) and allows the baseAddress parameter to be omitted or set to null, in which case the default is used. ([[1]](https://github.com/enjin/platform-csharp-sdk/pull/37/files#diff-8c215af18b2a74aa2e062a881e7f06467aee7a5217469101ff44a81ae5759d20R18-R22), [[2]](https://github.com/enjin/platform-csharp-sdk/pull/37/files#diff-8c215af18b2a74aa2e062a881e7f06467aee7a5217469101ff44a81ae5759d20L61-R77))
• The default User-Agent string was updated to a more descriptive value: Enjin-Platform-CSharp-SDK/{version}. ([src/Enjin.Platform.Sdk/Enjin.Platform.Sdk/Platform/PlatformClient.csL41-R46](https://github.com/enjin/platform-csharp-sdk/pull/37/files#diff-8c215af18b2a74aa2e062a881e7f06467aee7a5217469101ff44a81ae5759d20L41-R46))
• Additional unit tests were added to verify that the default and null baseAddress behaviors work as intended. ([src/Enjin.Platform.Sdk/Enjin.Platform.Sdk.Tests/Unit/Platform/PlatformClientSmokeTest.csL214-R241](https://github.com/enjin/platform-csharp-sdk/pull/37/files#diff-a1b48eea8d79912c8cd3e0cb2309a0b848c9fec428f5300b7587639bbc6301a8L214-R241))

[JayPavlina]

Needs a few things before merge:

• Add the NUGET_API_KEY secret in repo Settings → Secrets and variables → Actions. Use an API key from nuget.org scoped to the Enjin.Platform.Sdk package.
• UNITY_SDK_DEPLOY_KEY ssh key needs to be set up
• v3.0.0 release and tag should be deleted
• should do a dry run of the workflow on this branch (of parts that can be tested) after those things are done

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Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.