remove github action

.github/workflows/maven.yml

@@ -1,30 +0,0 @@
-name: Fess with Maven
-
-on: [push, pull_request]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: Set up JDK 11
-      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
-      run: mvn package
-    - name: Set up Integration Test
-      run: bash .travis/before_script.sh
-    - name: Run Integration Test
-      run: bash .travis/run.sh
-