Add GitHub Actions workflow for automatic site publishing

[Copilot]

Adds automated site publishing via GitHub Actions, similar to mojohaus/mojohaus.github.io setup.

Workflow Behavior

• Builds Maven site on all branches (except master) for validation
• Deploys to master branch on push to source branch using maven-scm-publish-plugin
• Uses JDK 11 with Temurin distribution and Maven caching

Security Hardening

• Untrusted inputs (commit author, ID) passed through environment variables to prevent script injection
• Explicit contents: write permission set on GITHUB_TOKEN (minimal required scope)

- name: Setup deploy
  env:
    COMMIT_EMAIL: ${{ github.event.head_commit.author.email }}
    COMMIT_NAME: ${{ github.event.head_commit.author.name }}
  run: |
    git config --global user.email "$COMMIT_EMAIL"
    git config --global user.name "$COMMIT_NAME"

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• www.apache.org
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.11/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.11/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.11 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.11/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/codehaus-plexus.github.io/codehaus-plexus.github.io org.codehaus.plexus.classworlds.launcher.Launcher --batch-mode clean site (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>add auto publishing site</issue_title>
<issue_description>We can use GitHub action to automatically publish site after commit

Like in: https://github.com/mojohaus/mojohaus.github.io/blob/site/.github/workflows/site.yml</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes add auto publishing site #11

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