Cache Maven packages

Author: nakamura-to

.github/workflows/maven.yml

@@ -19,13 +19,19 @@ jobs:
         java-version: 11
     - name: Grant execute permission for mvnw
       run: chmod +x mvnw
+    - name: Cache Maven packages
+      uses: actions/cache@v2
+      with:
+        path: ~/.m2
+        key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+        restore-keys: ${{ runner.os }}-m2
     - name: Build with Maven
       run: ./mvnw -B package --file pom.xml
     - name: Release Maven package
+      if: "github.event_name != 'pull_request'"
       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'"