add cache

.github/workflows/maven.yml

@@ -1,13 +1,6 @@
-# This workflow will build a Java project with Maven
-# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
+name: Fess with Maven
 
-name: Java CI with Maven
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
+on: [push, pull_request]
 
 jobs:
   build:
@@ -20,6 +13,12 @@ jobs:
       uses: actions/setup-java@v1
       with:
         java-version: 11
+    - uses: actions/cache@v1
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-maven-
     - name: Set up Fess
       run: mvn antrun:run
     - name: Build Fess
@@ -29,4 +28,3 @@ jobs:
     - name: Run Integration Test
       run: bash .travis/run.sh
 
-