Data Pipeline: Middleware Server for better Slack Trigger

[rivernews]

We will build a nodejs server. Simple, fast development, reasonable performance.

Reference

• Docker Node.js best practice
• Quickstart guide in Node.js official doc

[rivernews]

Steps remaining:

• [x] Create secret management secrets for the server
• [x] Supply env var in iriversland-k8, and supply container infos
• [x] terraform apply!
• [x] wait for awhile, and check when it's ready
• [x] Try to access / - should see a response with "Hello" or something.
• [x] Update slack outgoing webhook url - match that with our deployed host name.
• [x] Tail log the node server. Now slack launch <company name> in channel. Now observe the node server log, does it print the request?

[rivernews]

A repository dedicated to this server is created, will now close this ticket.