Add release configuration in Travis (#65)

.travis.yml

@@ -15,9 +15,14 @@ branches:
 
 install: travis_retry mvn install -DskipTests=true -B -V
 
-matrix:
+stages:
+  - test
+  - release
+
+jobs:
   include:
-    - name: "Build and test"
+    - stage: test
+      name: "Build and test"
       script: travis_retry mvn test
     - name: "WhiteSource scan"
       # only on support branches or master and if it is not a PR
@@ -26,4 +31,14 @@ matrix:
         # Download the latest version of WhiteSource Unified Agent
         - curl -LJO https://github.com/whitesource/unified-agent-distribution/raw/master/standAlone/wss-unified-agent.jar
         # Run WhiteSource Unified Agent
-        - java -jar wss-unified-agent.jar -apiKey ${WHITESOURCE_API_KEY} -c .wss-unified-agent.config
+        - java -jar wss-unified-agent.jar -apiKey ${WHITESOURCE_API_KEY} -c .wss-unified-agent.config
+    - stage: release
+      name: "Push to Nexus"
+      if: fork = false AND branch = master AND type != pull_request AND commit_message !~ /\[no-release\]/
+      before_install:
+        - "cp .travis.settings.xml $HOME/.m2/settings.xml"
+      script:
+        # Use full history for release
+        - git checkout -B "${TRAVIS_BRANCH}"
+        # Skip building of release commits
+        - mvn --batch-mode  -DscmCommentPrefix="[maven-release-plugin][skip ci] " -Dusername="${GIT_USERNAME}" -Dpassword="${GIT_PASSWORD}" -DskipTests -Darguments=-DskipTests release:clean release:prepare release:perform