feat(ci): add cli option to enable running of CI on release or snapshot commits

Fixes #20

Author: evansiroky

README.md

@@ -85,6 +85,13 @@ after_success:
   - semantic-release --prepare @conveyal/maven-semantic-release --publish @semantic-release/github,@conveyal/maven-semantic-release --verify-conditions @semantic-release/github,@conveyal/maven-semantic-release --verify-release @conveyal/maven-semantic-release --use-conveyal-workflow --dev-branch=dev --skip-maven-deploy
 ```
 
+By default the commit message contains the appendix '[ci skip]' that skips the pipeline to run when the pom.xml is pushed. This can be disabled for snapshot and final versions if needed by providing the flag `disable-snapshot-skip-ci` or  `disable-final-skip-ci`. For example:
+
+```
+after_success:
+  - semantic-release --prepare @conveyal/maven-semantic-release --publish @semantic-release/github,@conveyal/maven-semantic-release --verify-conditions @semantic-release/github,@conveyal/maven-semantic-release --verify-release @conveyal/maven-semantic-release --use-conveyal-workflow --dev-branch=dev --disable-snapshot-skip-ci --disable-final-skip-ci
+```
+
 #### before_install
 
 Be sure to include the import of your signing keys.  If you followed everything correctly in step 4 you should have something like the following added to your .travis.yml file:

lib/git.js

@@ -99,9 +99,19 @@ async function saveChangesToPomXml (context, versionStr) {
   const {branch, repositoryUrl} = options
   const execaOpts = {env, cwd}
 
-  const commitMessage = versionStr.indexOf('SNAPSHOT') > -1
-    ? `Prepare next development iteration ${versionStr} [ci skip]`
-    : `${versionStr} [ci skip]`
+  const isSnapshotVersion = versionStr.indexOf('SNAPSHOT') > -1
+  let commitMessage
+  if (isSnapshotVersion) {
+    commitMessage = `Prepare next development iteration ${versionStr}`
+    if (options.disableSnapshotSkipCi == null || !options.disableSnapshotSkipCi) {
+      commitMessage += ' [ci skip]'
+    }
+  } else {
+    commitMessage = `${versionStr}`
+    if (options.disableFinalSkipCi == null || !options.disableFinalSkipCi) {
+      commitMessage += ' [ci skip]'
+    }
+  }
 
   logger.log('adding pom.xml files to a commmit')
   await add(['pom.xml'], execaOpts)