Only run GitHub actions from jenkinsci org

[MarkEWaite]

Only run GitHub actions from jenkinsci org

No need to deploy site on forks

Testing done

Technique is working for jenkins.io and for several other repositories.

Submitter checklist

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1. Make sure you are opening from a **topic/feature/bugfix branch** (right side) and not your main branch!

   Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
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2. Ensure that the pull request title represents the desired changelog entry

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3. Please describe what you did

   Please describe what you did
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4. Link to relevant issues in GitHub or Jira

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5. Link to relevant pull requests, esp. upstream and downstream changes

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[basil]

I fixed up a few others:

./jellydoc-maven-plugin/.github/workflows/site.yml
./jelly/.github/workflows/site.yml
./license-maven-plugin/.github/workflows/site.yml
./maven-hpi-plugin/.github/workflows/site.yml
./stapler-maven-plugin/.github/workflows/site.yml

[MarkEWaite]

Thanks!