Add Create A Public URL For A Local Server as a workflow til

workflow/create-a-public-url-for-a-local-server.md

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+# Create A Public URL For A Local Server
+
+At times while developing an app locally, you need to expose the local server
+to the public internet. This can be useful and necessary when working on a
+3rd-party integration or when you want to show what you have running locally to
+someone else.
+
+In addition to tools like [ngrok](https://ngrok.com/), I've found the
+[`localtunnel`](https://github.com/localtunnel/localtunnel) npm package to be
+an effective way to quickly expose a localhost port.
+
+```
+$ npx localtunnel --port 3000 --subdomain some-custom-subdomain
+your url is: https://some-custom-subdomain.loca.lt
+```
+
+This will create a `loca.lt` URL with the given subdomain that tunnels
+requests to `localhost:3000`. If the `--subdomain` flag is not specified or
+what you've specified isn't available, `localtunnel` will generate a random
+subdomain.
+
+For the subdomain, I recommend using something sufficiently unique like
+`josh-branchaud-04092021`. Using the date has the added benefit of
+contextualizing when I generated the URL.
+
+In my experience, these are not long-lived domains. Sometimes the connection
+gets interrupted and you'll have to restart it. Often when restarting, the
+specified subdomain will then be flagged as unavailable, so you have to tweak
+it a little.
+
+Because it is using `npx`, there is nothing to install as long as you already
+have `node` itself installed.