Update maven.yml

.github/workflows/maven.yml

@@ -27,6 +27,15 @@ jobs:
         key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
         restore-keys: |
           ${{ runner.os }}-maven-
+    - name: Checkout fess-parent
+      uses: actions/checkout@v2
+      with:
+        repository: codelibs/fess-parent
+        path: fess-parent
+    - name: Install fess-parent
+      run: |
+        cd fess-parent
+        mvn install
     - name: Download Plugins with Maven
       run: mvn -B antrun:run --file pom.xml
     - name: Build with Maven