Add ci workflow

- Relates #165

.github/workflows/ci.yml

@@ -0,0 +1,27 @@
+name: CI
+
+on:
+  workflow_dispatch:
+  push:
+    paths-ignore:
+      - '.github/**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - nickname: linux jdk17
+            java: 17
+    name: CI Build ${{ matrix.nickname }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v3
+        with:
+          distribution: adopt
+          java-version: ${{ matrix.java }}
+          cache: gradle
+      - name: Build
+        run: ./gradlew build