Only publish to NPM on release.

on_push.js

@@ -19,21 +19,10 @@ exec('npm install', {async:true}, function () {
 exec('gulp web', {async:true}, function() {
 
 // This dir should have its own .git/
-cd('build/gh-pages'); 
+cd('build/gh-pages');
 exec('git commit --amend --no-edit');
 exec('git push --force origin gh-pages');
 cd('../..');
 
-//
-// Publish library to pdfjs-dist
-//
-exec('gulp dist', {async:true}, function() {
-
-cd('build/dist');
-exec('git push --tags git@github.com:mozilla/pdfjs-dist.git master');
-exec('npm publish');
-cd('../..');
-
-}); // gulp dist
 }); // gulp web
 }); // npm install

on_release.js

@@ -0,0 +1,25 @@
+var botio = require(process.env['BOTIO_MODULE']);
+var path = require('path');
+require('shelljs/global');
+
+try {
+  var jobInfo = JSON.parse(process.env['BOTIO_JOBINFO']);
+  var reason = 'See mozilla/pdf.js@' + jobInfo.head_sha;
+  process.env['PDFJS_UPDATE_REASON'] = reason;
+  echo('>> Setting reason to: ' + reason);
+} catch (_) {}
+
+exec('npm install', {async:true}, function () {
+
+//
+// Publish library to pdfjs-dist
+//
+exec('gulp dist', {async:true}, function() {
+
+cd('build/dist');
+exec('git push --tags git@github.com:mozilla/pdfjs-dist.git master');
+exec('npm publish' + (jobInfo.prerelease ? ' --tag next' : ''));
+cd('../..');
+
+}); // gulp dist
+}); // npm install