Pass Json file content in docker-compose.yml

Question

I need to pass contents of JSON file as value of environment variable USER_PASS in docker-compose.yml file. The docker-compose.yml file looks like following:

  watchtower:
    image: v2tec/watchtower
    environment:
      - REPO_USER=_json_key
      - REPO_PASS=?????

and Json file looks as follows:

{
  "type": "service_account",
  "project_id": "xxx",
  ....
}

I tried passing the Json text in many ways like surrounding it with single quotes, removing new line etc but nothing is working. Any idea how to accomplish this?

Answer 1

I just removed all the spaces along with new line characters and it worked.