[CAL-2635] make cal.com dockerable – refactor constant.ts

[PeerRich]

core issue:

• environment variables should not end up in build output
• all environment variables should be runtime only

problem:

• our docker image has 100k pulls and is not useable for production right now https://hub.docker.com/r/calcom/cal.com

_{From SyncLinear.com | CAL-2635}

[Drex72]

So quick question @PeerRich , are we supposed to create a new docker image that doesnt allow environment variables to end up in build output, or we're meant to fix the existing docker image?

[mbaraa]

hey, can I be assigned?
I opened this PR in the docker repository, should I open an issue there there or what.