Release scripts

[JWinermaSplunk]

add gitlab releasing support for packages

[johnbley]

I think there are some areas where the copy-paste-adjust pathway from splunk-otel-python went askew. Double check by grepping for key strings like splunk-opentelemetry and splunk-otel-python and adjusting those references as needed.
Overall looks like a good start though!

[johnbley]

Take another pass and be super sure that nothing attempts to release or document how to release something named splunk-opentelemetry - read back through these instructions and scope it just to releasing the genai work.

[zhirafovod]

I think there are some areas where the copy-paste-adjust pathway from splunk-otel-python went askew. Double check by grepping for key strings like splunk-opentelemetry and splunk-otel-python and adjusting those references as needed. Overall looks like a good start though!

@JWinermaSplunk , we probably should remove the entire ./pyproject.toml file in the root folder, was copy pasted as @johnbley notied. But let's do it in a follow-up PR, as it is not included in ay PRs

# Used for local development, not to be published.
[project]
name = "splunk-opentelemetry-python-contrib"
...

[zhirafovod]

Looks good, thank you @johnbley and @JWinermaSplunk !