Add github build workflow

Author: booky10

.github/workflows/build.yml

@@ -0,0 +1,35 @@
+name: Build
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - "master"
+
+jobs:
+  build:
+    runs-on: ubuntu-24.04
+    if: "!contains(github.event.head_commit.message, 'skip ci') && !contains(github.event.head_commit.message, 'ci skip')"
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Validate gradle wrapper
+        uses: gradle/actions/wrapper-validation@v4
+
+      - name: Setup java 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: 21
+          distribution: temurin
+          cache: gradle
+
+      - name: Build plugin
+        run: ./gradlew build --no-daemon
+
+      - name: Upload plugin jars
+        uses: actions/upload-artifact@v4
+        with:
+          name: CloudChat-Artifacts
+          path: build/libs/CloudChat-*
+          if-no-files-found: error