Define release and snapshot github workflows

.github/workflows/release.yml

@@ -0,0 +1,20 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Build with Gradle
+        run: ./gradlew build

.github/workflows/snapshot.yml

@@ -0,0 +1,25 @@
+name: Snapshot
+
+on:
+  push:
+    branches:
+      - develop
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Build with Gradle
+        run: ./gradlew build
+      - name: Publish snapshot
+        env:
+          username: ${{ secrets.NEXUS_USERNAME }}
+          password: ${{ secrets.NEXUS_PASSSWORD }}
+        run: ./gradlew upA -Prelease -PNEXUS_USERNAME=$username -PNEXUS_PASSWORD=$password