ci(travis): utilize Build Stages

Utilize Build Stages in the Travis CI configuration to run
`commit-lint`in its own job, and run the deploy only on commits to
master.

Author: Arcanemagus

.travis.yml

@@ -1,19 +1,42 @@
 ### Project specific config ###
-language: generic
+language: node_js
+node_js: lts/*
+install: skip
+os: linux
 
-matrix:
+jobs:
   include:
-    - os: linux
+    # Test Atom versions
+    - stage: test
       env: ATOM_CHANNEL=stable
-
-    - os: linux
+    - stage: test
       env: ATOM_CHANNEL=beta
 
+    # Check the commit messages and run the extra lint script
+    - stage: test
+      install:
+        - npm install
+      before_script: skip
+      script:
+        - commitlint-travis
+        - npm run lint
+
+    - stage: release
+      # Since the deploy needs APM, currently the simplest method is to run
+      # build-package.sh, which requires the specs to pass.
+      before_deploy:
+        - export PATH=${PATH}:${HOME}/atom/usr/bin/
+      deploy:
+        provider: script
+        skip_cleanup: true
+        script:
+          - npx semantic-release
+
 ### Generic setup follows ###
 script:
   - curl -s -O https://raw.githubusercontent.com/atom/ci/master/build-package.sh
   - chmod u+x build-package.sh
-  - ./build-package.sh
+  - "./build-package.sh"
 
 notifications:
   email:
@@ -23,6 +46,7 @@ notifications:
 branches:
   only:
     - master
+    - "/^greenkeeper/.*$/"
 
 git:
   depth: 10
@@ -35,18 +59,11 @@ addons:
   apt:
     packages:
     - build-essential
-    - fakeroot
     - git
-    - libsecret-1-dev
-
-node_js: lts/*
-
-after_success:
-  # Add apm to the PATH
-  - export PATH=${PATH}:${HOME}/atom/usr/bin/
+    - libgnome-keyring-dev
+    - fakeroot
 
-deploy:
-  provider: script
-  skip_cleanup: true
-  script:
-    - npx semantic-release
+stages:
+  - test
+  - name: release
+    if: (NOT type = pull_request) AND branch = master