add maven build

.github/workflows/maven-build.yml

@@ -0,0 +1,24 @@
+name: CI
+
+on: [ push, pull_request ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    if: ${{ !contains(github.event.head_commit.message, '[ci skip]') }}
+    strategy:
+      matrix:
+        java: [ '11' ]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK ${{ matrix.java }}
+        uses: actions/setup-java@v1
+        with:
+          java-version: ${{ matrix.java }}
+      - name: Build with Maven
+        run: mvn -B package --file pom.xml
+      - name: Upload Artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: Barrel
+          path: target/Barrel-1.0.0-SNAPSHOT.jar