fix(release): only publish alpha and production releases to NPM

Author: dkoo

scripts/release.js

@@ -12,11 +12,7 @@ const filesList = files.split( ',' );
 
 utils.log( `Releasing ${ process.env.CIRCLE_PROJECT_REPONAME }…` );
 
-const shouldPublishOnNPM = Boolean( process.env.NPM_TOKEN );
-
-if ( shouldPublishOnNPM ) {
-	utils.log( `Will publish on npm` );
-}
+let shouldPublishOnNPM = Boolean( process.env.NPM_TOKEN );
 
 const getConfig = ({ gitBranchName }) => {
 	const branchType = gitBranchName.split("/")[0];
@@ -35,6 +31,12 @@ const getConfig = ({ gitBranchName }) => {
 		githubConfig.failComment = false;
 	}
 
+	// Only publish alpha and release branches to NPM.
+	shouldPublishOnNPM = shouldPublishOnNPM && ["alpha", "release"].includes(branchType);
+	if ( shouldPublishOnNPM ) {
+		utils.log( `Will publish to npm.` );
+	}
+
 	const config = {
 		dryRun: otherArgs.dryRun,
 		ci: otherArgs.ci,