Publish alpha release any time we're not on a release branch or master

Author: jonrohan

script/after_success

@@ -1,10 +1,11 @@
 #!/bin/bash
 set -e
 
-branch=$TRAVIS_BRANCH
+branch=$TRAVIS_PULL_REQUEST_BRANCH
 event=$TRAVIS_EVENT_TYPE
 
 # only publish canary releases on PRs against dev
-if [[ "$event" = "pull_request" && "$branch" = "dev" ]]; then
+if [[ "$event" = "pull_request" ]] && [[ !("$branch" =~ ^release-.*) ]] && [[ !("$branch" = "master") ]];
+then
   script/release-pr --yes
 fi