Update Dockerfile to use workspaces setup

The main Cal.com project has started using Yarn workspaces to
break the project up into separate packages and treat the project
as a monorepo. This required quite a few changes to the Dockerfile
that assumed the previous project setup.

Signed-off-by: Alex Sears <me@alexsears.com>

scripts/start.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 set -x
 
-/app/scripts/wait-for-it.sh ${DATABASE_HOST} -- echo "database is up"
-npx prisma migrate deploy
+/calcom/scripts/wait-for-it.sh ${DATABASE_HOST} -- echo "database is up"
+# npx prisma migrate deploy --schema /calcom/packages/prisma/schema.prisma
 yarn start