ci: добавить GitHub Actions (build + release)

.github/workflows/build.yml

@@ -0,0 +1,47 @@
+name: Build & Test
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    name: Build LoChat
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+          cache: gradle
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Build & Test
+        run: ./gradlew build --no-daemon
+
+      - name: JaCoCo Report
+        uses: actions/upload-artifact@v4
+        with:
+          name: jacoco-report
+          path: build/reports/jacoco/test/html/
+
+      - name: Test Results
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results
+          path: build/test-results/
+
+      - name: Plugin JAR
+        uses: actions/upload-artifact@v4
+        with:
+          name: LoChat-Plugin
+          path: build/libs/LoChat-*.jar