Updates Semaphore CI Service for 2.0 (#132)

* Updates Semaphore CI Service for 2.0

Semaphore launched their 2.0 on November 6th 2018. The current Semaphore
Service is using environment variables no longer present with Semaphore
2.0. I've purposefully removed the `build` and `slug` tags from the
generated config as there is no good equivalent with Semaphore 2.0
anymore. List of 'git env vars' can be found at
https://docs.semaphoreci.com/article/12-environment-variables

* Adds the build tag back

As requested, the `build` tag has been added back to the config and will
now be read from the `SEMAPHORE_WORKFLOW_ID` as it's unique per 'run
through the CI pipeline'.

lib/services/semaphore.js

@@ -7,13 +7,9 @@ module.exports = {
     console.log('    Semaphore CI Detected')
     return {
       service: 'semaphore',
-      build:
-        process.env.SEMAPHORE_BUILD_NUMBER +
-        '.' +
-        process.env.SEMAPHORE_CURRENT_THREAD,
-      commit: process.env.REVISION,
-      branch: process.env.BRANCH_NAME,
-      slug: process.env.SEMAPHORE_REPO_SLUG,
+      branch: process.env.SEMAPHORE_GIT_BRANCH,
+      build: process.env.SEMAPHORE_WORKFLOW_ID,
+      commit: process.env.SEMAPHORE_GIT_SHA,
     }
   },
 }

test/services/semaphore.test.js

@@ -7,17 +7,14 @@ describe('Semaphore CI Provider', function() {
   })
 
   it('can get semaphore env info', function() {
-    process.env.SEMAPHORE_BUILD_NUMBER = '1234'
-    process.env.REVISION = '5678'
-    process.env.SEMAPHORE_CURRENT_THREAD = '1'
-    process.env.BRANCH_NAME = 'master'
-    process.env.SEMAPHORE_REPO_SLUG = 'owner/repo'
+    process.env.SEMAPHORE_GIT_BRANCH = 'development'
+    process.env.SEMAPHORE_GIT_SHA = '5c84719708b9b649b9ef3b56af214f38cee6acde'
+    process.env.SEMAPHORE_WORKFLOW_ID = '65c9bb1c-aeb6-41f0-b8d9-6fa177241cdf'
     expect(semaphore.configuration()).toEqual({
       service: 'semaphore',
-      commit: '5678',
-      build: '1234.1',
-      branch: 'master',
-      slug: 'owner/repo',
+      branch: 'development',
+      build: '65c9bb1c-aeb6-41f0-b8d9-6fa177241cdf',
+      commit: '5c84719708b9b649b9ef3b56af214f38cee6acde',
     })
   })
 })