Setting up a CI pipeline based on GitHub Actions (firebase#342)

* Setting up a CI pipeline based on GitHub Actions

* Renamed file

Author: hiranya911

.github/workflows/ci.yml

@@ -0,0 +1,17 @@
+name: Java Continuous Integration
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up JDK 1.7
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.7
+    - name: Build with Maven
+      run: mvn -B package --file pom.xml