Add SSH Into Heroku Server Hosting App as a Heroku TIL

heroku/ssh-into-heroku-server-hosting-app.md

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+# SSH Into Heroku Server Hosting App
+
+Heroku hosts and deploys your app on a remote server. One of Heroku's primary
+offerings is that it abstracts away the details of that server. You generally
+don't need to think about it. Instead you can use the Heroku CLI to interact
+with it indirectly.
+
+There will inevitably be a time when you need to access that server directly.
+Heroku gives you a way to do this with their CLI through
+[`ps:exec`](https://devcenter.heroku.com/articles/exec).
+
+```bash
+$ heroku ps:exec --app my-app
+```
+
+This will connect you to an SSH session with the server that the app is running
+on.