remove hardcoded db url and add database_host var

.env

@@ -1,7 +1,8 @@
 POSTGRES_USER=unicorn_user
 POSTGRES_PASSWORD=magical_password
 POSTGRES_DB=calendso
-DATABASE_URL="postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@db:5432/${POSTGRES_DB}"
+DATABASE_HOST=db:5432
+DATABASE_URL="postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${DATABASE_HOST}/${POSTGRES_DB}"
 GOOGLE_API_CREDENTIALS='secret'
 BASE_URL='http://localhost:3000'
 NEXTAUTH_URL='http://localhost:3000'

scripts/start.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 set -x
 
-/app/scripts/wait-for-it.sh db:5432 -- echo "db is up"
+/app/scripts/wait-for-it.sh ${DATABASE_HOST} -- echo "db is up"
 npx prisma db push
 yarn start