Add auth support (#21)

* Updates

* Update

* Update

* Update

* Update

* Yarn sometimes prefers npmrc, so use same token

* Description

* Update readme

* Feedback

* Add type

* new toolkit and scoped registries

* npmrc in RUNNER_TEMP

* Dont always auth

* Try exporting blank token

* Get auth working for now pending runner changes

* Fix string interpolation for auth token.

* Don't export both userconfigs

* Update authutil.js

* Add single quotes for authString

* Fix the registry string.

* Use userconfig and append trailing slash

* Keep in root of repo

* Try just adding auth token

* Remove auth token

* Try changes again

* Add tests

* Npm and GPR samples

* Add types

node_modules/@octokit/endpoint/dist-src/util/omit.js

@@ -0,0 +1,8 @@
+export function omit(object, keysToOmit) {
+    return Object.keys(object)
+        .filter(option => !keysToOmit.includes(option))
+        .reduce((obj, key) => {
+        obj[key] = object[key];
+        return obj;
+    }, {});
+}