feat: Add an express app tha redirects to the slack invite url.

.editorconfig

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+[*]
+end_of_line = lf
+insert_final_newline = true
+
+[*.{js,json,yml}]
+charset = utf-8
+indent_style = space
+indent_size = 2

.gitignore

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 node_modules/
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions

.yarnrc.yml

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+yarnPath: .yarn/releases/yarn-3.2.1.cjs

Procfile

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+web: yarn start

README.rst

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+openedx-slack-invite
+####################
+
+This app used to be a slack invite app based on
+https://github.com/outsideris/slack-invite-automation
+
+We've now replaced it with a simple redirect app to the slack invite link.
+
+We're still keeping the app around incase the old heroku URL was hardcoded in
+more places. If it's been more than a year since July 2022 this repo and the
+corresponding herokuapp can both be archived.
+
+See https://github.com/openedx/tcril-engineering/issues/346 for more info.
+
+Getting Started
+***************
+
+Local Development
+=================
+
+.. code::
+
+   git clone git@github.com:openedx/openedx-slack-invite
+   cd openedx-slack-invite
+   yarn install  # Install the dependencies
+   yarn run start  # Start the server.
+
+The entire app is in the app.js file so edit that if you need to change
+anything.
+
+Deploying to Heroku
+===================
+
+One Time Setup
+--------------
+
+.. code::
+
+   heroku config:set REDIRECT_URL="path/to/slack/invite/url"
+
+For Each Deploy
+---------------
+
+.. code::
+
+   git push heroku master
+   heroku logs -a openedx-slack-invite -t # tail the logs

app.js

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+const express = require('express')
+const app = express()
+const port = process.env.PORT || 3000
+const redirect_url = process.env.REDIRECT_URL || "https://example.com"
+
+app.get('/', (req, res) => {
+    res.redirect(redirect_url)
+})
+
+app.listen(port, () => {
+    console.log(`Redirect app listening on port ${port}`)
+})

package.json

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+{
+  "name": "openedx-slack-invite",
+  "packageManager": "yarn@3.2.1",
+  "dependencies": {
+    "express": "^4.18.1"
+  },
+  "scripts": {
+    "start": "node app.js"
+  }
+}