docs/trusted-publishing: Add GitLab CI/CD support

[Turbo87]

Updates the Trusted Publishing documentation to include GitLab CI/CD support alongside GitHub Actions. GitLab support is marked as public beta.

Related

• Trusted Publishing support for GitLab CI #11987

[eth3lbert]

Awesome, thanks! 👍 Are there any existing demos or tests that use the provided script for GitLab to ensure everything works great and smoothly without unexpected mistakes?

[Turbo87]

Are there any existing demos or tests that use the provided script for GitLab to ensure everything works great and smoothly without unexpected mistakes?

I only tested it manually on the staging environment. I'm not sure if having automated tests for this is viable.

[eth3lbert]

Are there any existing demos or tests that use the provided script for GitLab to ensure everything works great and smoothly without unexpected mistakes?

I only tested it manually on the staging environment. I'm not sure if having automated tests for this is viable.

Ah, I wasn't referring to automated tests here. I meant a reference location where we might double-check the documentation for potential errors, such as a simple copy-paste error or something else.