Add gh actions

.github/workflows/build.yml

@@ -0,0 +1,23 @@
+name: Build
+on: [ push, pull_request ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    if: "!contains(github.event.commits[0].message, '[ci-skip]')"
+    steps:
+      - uses: actions/checkout@v2
+      - uses: gradle/wrapper-validation-action@v1
+      - uses: actions/setup-java@v2
+        with:
+          distribution: temurin
+          java-version: 17
+      - name: Configure Git
+        run: git config --global user.email "no-reply@github.com" && git config --global user.name "Github Actions"
+      - name: Build
+        run: ./gradlew build --stacktrace
+      - name: Upload artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: Chat.jar
+          path: build/libs/Chat*.jar

build.gradle.kts

@@ -26,6 +26,10 @@ subprojects {
         withType<Javadoc> {
             options.encoding = Charsets.UTF_8.name()
         }
+
+        withType<JavaCompile> {
+            options.isDeprecation = true
+        }
     }
 }