Add demo plugin publish workflow

.gitea/workflows/deploy-demo-plugin.yml

@@ -0,0 +1,46 @@
+name: Deploy Demo Plugin
+
+on:
+  push:
+    branches: ["master"]
+    paths: [".gitea/workflows/deploy-demo-plugin.yml", "DemoSpigotPlugin/**", "!DemoSpigotPlugin/README.md"]
+
+jobs:
+  docker:
+    strategy:
+      matrix:
+        java-version: ["17"]
+        maven-version: ["3.8.5"]
+    runs-on: "ubuntu-latest"
+    defaults:
+      run:
+        working-directory: "./DemoSpigotPlugin"
+
+    # Steps to run
+    steps:
+      # Checkout the repo
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      # Setup Java and Maven
+      - name: Set up JDK and Maven
+        uses: s4u/setup-maven-action@v1.12.0
+        with:
+          java-version: ${{ matrix.java-version }}
+          distribution: "zulu"
+          maven-version: ${{ matrix.maven-version }}
+
+      # Build and package the jar
+      - name: Build Jar
+        run: mvn clean package -q -T4C
+
+      # TODO: upload jar via ftp
+      - name: Upload Jar
+        run: echo "Upload jar to FTP"
+
+      - name: Restart Remote Server
+        uses: hwalker928/ptero-gitsync@v1.0
+        with:
+          panel-url: ${{ secrets.PTERO_URL }}
+          api-key: ${{ secrets.PTERO_API_KEY }}
+          server-id: ${{ secrets.DEMO_SERVER_ID }}