Add maven.yml

Author: nakamura-to

.github/workflows/maven.yml

@@ -0,0 +1,31 @@
+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    if: "! contains(toJSON(github.event.commits.*.message), '[skip ci]')"
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+      - name: Grant execute permission for mvnw
+        run: chmod +x mvnw
+      - name: Build with Maven
+        run: ./mvnw -B package --file pom.xml
+      - name: Release Maven package
+        uses: samuelmeuli/action-maven-publish@v1
+        with:
+          gpg_private_key: ${{ secrets.SIGNING_KEY }}
+          gpg_passphrase: ${{ secrets.SIGNING_PASSWORD }}
+          nexus_username: ${{ secrets.OSSRH_USERNAME }}
+          nexus_password: ${{ secrets.OSSRH_PASSWORD }}
+      if: "github.event_name != 'pull_request'"