Add GitHub Actions workflow for automatic site publishing

Co-authored-by: slachiewicz <[email protected]>

Author: Copilot

.github/workflows/site.yml

@@ -0,0 +1,55 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+name: Site CI
+
+on:
+  push:
+    branches:
+      - '*'
+      - '!master'
+  pull_request:
+    branches:
+      - '*'
+      - '!master'
+
+jobs:
+
+  site:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          java-version: '11'
+          distribution: 'temurin'
+          cache: 'maven'
+
+      - name: Setup deploy
+        id: setup
+        if: github.event_name == 'push' && github.repository_owner == 'codehaus-plexus' && github.ref == 'refs/heads/source'
+        run: |
+          git config --global user.email "${{ github.event.head_commit.author.email }}"
+          git config --global user.name "${{ github.event.head_commit.author.name }}"
+          echo "deploy=-deploy -Dusername=git -Dpassword=${{ github.token }} -Dscmpublish.checkinComment='Site checkin for ${{ github.event.head_commit.id }}'" >> $GITHUB_OUTPUT
+
+      - name: Build with Maven
+        run: mvn --show-version --errors --batch-mode --update-snapshots clean site${{ steps.setup.outputs.deploy }}