Use commit id in source code url property of gemspec

[thompson-tomo]

To enable removal of the source code of packages no longer supported, it would be useful if the published gems pointed to the commit of the source code used. Ideally the file path is also set.

On looking into it we should be able to add the following:

commit = ENV["GITHUB_SHA"] || "main"

Then update the url

spec.metadata["source_code_uri"] =
"https://github.com/open-telemetry/opentelemetry-ruby-contrib/tree/#{commit}/instrumentation/ruby_kafka"

This way the commit id is used on github otherwise main is used.

[github-actions]

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