Enable gitaction in develop branch

Author: rdasgupt

.github/workflows/main.yaml

@@ -0,0 +1,34 @@
+# Workflow to build mqtt.paho.java library 
+
+name: Java CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        # os: [ubuntu-latest, macOS-latest, windows-latest]
+        # java: [ 8.0.192, 8, 11.0.3, 17, 18-ea ]
+        os: [ubuntu-latest]
+        java: [ 8.0.192 ]
+      fail-fast: false
+      max-parallel: 4
+    name: Build MQTT Paho Java on JDK ${{ matrix.java }}, ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK ${{ matrix.java }} ${{ matrix.os }}
+        uses: actions/setup-java@v1
+        with:
+          java-version: ${{ matrix.java }}
+          java-package: jdk
+      - name: Package with Maven skip tests
+        run: mvn -B --projects org.eclipse.paho.client.mqttv3 package -DskipTests
+

pom.xml

@@ -8,9 +8,8 @@
 
     <properties>
         <!-- source & target java version for MQTT Client -->
-        <mqttclient.java.version>1.8</mqttclient.java.version>
-        <!-- source & target java version for others modules -->
-        <java.version>1.8</java.version>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <build.level>${maven.build.timestamp}</build.level>
         <tycho.version>1.7.0</tycho.version>