Ensure the npm registry is used during "Publish" workflow (#4286)

Unset the `npm_config_registry` env var which yarn overwrites to the
yarn registry, which we don't want since the `.npmrc` file that gets
created is configured to the npm registry.

lerna.json

@@ -5,10 +5,9 @@
   "command": {
     "publish": {
       "npmClient": "npm",
-        "allowBranch": ["master", "canary"],
+      "allowBranch": ["master"],
       "registry": "https://registry.npmjs.org/"
     }
   },
   "version": "independent"
 }
-  

utils/publish-legacy.sh

@@ -23,6 +23,6 @@ for tag in $tags; do
     npm_tag="--tag canary"
   fi
 
-  echo "Running \`npm publish --registry=https://registry.npmjs.com $npm_tag\` in \"$(pwd)\""
-  echo "DRY: npm publish --registry=https://registry.npmjs.com $npm_tag"
+  echo "Running \`npm publish $npm_tag\` in \"$(pwd)\""
+  npm publish $npm_tag
 done

utils/publish.sh

@@ -1,6 +1,10 @@
 #!/bin/bash
 set -euo pipefail
 
+# `yarn` overwrites this value to use the yarn registry, which we
+# can't publish to. Unset so that the default npm registry is used.
+unset npm_config_registry
+
 __dirname="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 echo "__dirname: ${__dirname}"