How and wer to set the database url
WARNING: You should provide a DATABASE_URL by adding a database service to this application, it can be either MySQL or Postgres If this is the first push of a new app, set up a
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Traceback (most recent call last):
File "/tmp/buildpackdownloads/063299c9588a0e1d380502ed03d75f37/bin/compile", line 269, in <module>
preflight_check()
File "/tmp/buildpackdownloads/063299c9588a0e1d380502ed03d75f37/bin/compile", line 97, in preflight_check
raise Exception('Missing environment variables')
Exception: Missing environment variables
Failed to compile droplet: Failed to compile droplet: exit status 1
Exit status 223
Staging failed: STG: Exited with status 223
Stopping instance ff48f63e-e6b1-413a-b824-cae7e2f2154b
Destroying container
Successfully destroyed container
FAILED