Added documentation deploy action to www.etlcpp.com

.github/workflows/deploy_documentation.yml

@@ -0,0 +1,37 @@
+name: Deploy documentation to www.etlcpp.com
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build_deploy:
+    name: build and deploy
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+          fetch-depth: 0
+
+      - name: Setup Hugo
+        uses: peaceiris/actions-hugo@v3
+        with:
+          hugo-version: '0.147.1'
+          extended: true
+
+      - name: Build
+        working-directory: hugo
+        run: hugo --minify --cleanDestinationDir --baseURL "https://www.etlcpp.com/"
+
+      # Deploys the site via the deploy script in the ci directory
+      - name: Deploy
+        run: source $GITHUB_WORKSPACE/ci/deploy.sh
+        env:
+          ACTIONS_DEPLOY_KEY: ${{ secrets.DOCS_BDEPLOY_KEY }}
+          SSH_USERNAME: ${{ secrets.DOCS_SSH_USER }}
+          SERVER_ADDRESS: ${{ secrets.DOCS_SSH_SERVER }}
+          SERVER_DESTINATION: ${{ secrets.DOCS_DEST_DIR }}
+          SSH_PORT: ${{ secrets.DOCS_SSH_PORT }}