Simplify lint build in travis & grunt

refs #9441

- We have logic in travis and in grunt and in package.json, this simplifies things.
- `grunt lint` is now just an alias

.travis.yml

@@ -24,10 +24,10 @@ matrix:
     - node_js: "10"
       env: TEST_SUITE=lint
   fast_finish: true
-  
-branches:	
-  except:	
-    - /^renovate\/.+$/	
+
+branches:
+  except:
+    - /^renovate\/.+$/
 
 before_install:
   - if [ $DB == "mysql" ]; then mysql -e 'create database ghost_testing'; fi
@@ -41,10 +41,12 @@ install:
   - if [ "$DB" == "sqlite3" ]; then yarn add --force sqlite3; fi # fix sqlite caching issues
 
 script: |
-  if [[ ( "$TRAVIS_PULL_REQUEST_BRANCH" =~ ^renovate  || "$TRAVIS_EVENT_TYPE" == "cron" ) &&  "$TEST_SUITE" != "lint" ]]; then
-    yarn test:regression
+  if [ "$TEST_SUITE" == "lint" ]
+    yarn lint
+  elif [[ "$TRAVIS_PULL_REQUEST_BRANCH" =~ ^renovate || "$TRAVIS_EVENT_TYPE" == "cron" ]]; then
+    yarn ci:regression
   else
-    yarn test
+    yarn ci
   fi
 
 after_failure: |

Gruntfile.js

@@ -473,12 +473,8 @@ const configureGrunt = function (grunt) {
     // **Main testing task**
     //
     // `grunt validate` will either run all tests or run linting
-    // `grunt validate` is called by `npm test` and is used by Travis.
-    grunt.registerTask('validate', 'Run tests or lint code', function () {
-        if (process.env.TEST_SUITE === 'lint') {
-            return grunt.task.run(['lint']);
-        }
-
+    // `grunt validate` is called by `yarn test` and is used by Travis.
+    grunt.registerTask('validate', 'Run tests', function () {
         grunt.task.run(['test-acceptance', 'test-unit']);
     });
 

package.json

@@ -23,12 +23,14 @@
   "scripts": {
     "start": "node index",
     "dev": "DEBUG=ghost:* grunt dev",
-    "test": "grunt validate --verbose",
-    "test:regression": "grunt test-regression --verbose",
+    "test": "grunt validate",
+    "ci": "grunt validate --verbose",
+    "ci:regression": "grunt test-regression --verbose",
     "setup": "yarn install && knex-migrator init && grunt symlink && grunt init || true",
     "lint:server": "eslint --ignore-path .eslintignore 'core/server/**/*.js' 'core/*.js' '*.js'",
     "lint:test": "eslint -c core/test/.eslintrc.json --ignore-path core/test/.eslintignore 'core/test/**/*.js'",
     "lint": "yarn lint:server && yarn lint:test",
+    "posttest": "yarn lint",
     "fixmodulenotdefined": "yarn cache clean && cd core/client && rm -rf node_modules tmp dist && yarn && cd ../../"
   },
   "engines": {