Add action to build all packages in project (aws#121)

Author: carlzogh

.github/workflows/maven-pkg-all.yml

@@ -0,0 +1,30 @@
+# This workflow will build all Java packages in this project with Maven (Java 8)
+
+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ '*' ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+
+    - name: Build core with Maven
+      run: mvn -B package --file aws-lambda-java-core/pom.xml
+    - name: Build events with Maven
+      run: mvn -B package --file aws-lambda-java-events/pom.xml
+    - name: Build log4j with Maven
+      run: mvn -B package --file aws-lambda-java-log4j/pom.xml
+    - name: Build log4j2 with Maven
+      run: mvn -B package --file aws-lambda-java-log4j2/pom.xml