title: CI/CD pipeline with PostgreSQL failed with "Database is uninitialized and superuser password is not specified" error
body: <p>I'm using Bitbucket pipeline with PosgreSQL for CI/CD. According to this <a href="https://confluence.atlassian.com/bitbucket/test-with-databases-in-bitbucket-pipelines-856697462.html" rel="noreferrer">documentation</a> PostgreSQL service has been described in <code>bitbucket-pipelines.yml</code> this way:</p>
  
  <pre><code>definitions:
    services:
      postgres:
        image: postgres:9.6-alpine
  </code></pre>
  
  <p>It worked just fine until now. But all my latest pipelines failed with following error:</p>
  
  <pre><code>   Error: Database is uninitialized and superuser password is not specified.
     You must specify POSTGRES_PASSWORD for the superuser. Use
     "-e POSTGRES_PASSWORD=password" to set it in "docker run".
  
     You may also use POSTGRES_HOST_AUTH_METHOD=trust to allow all connections
     without a password. This is *not* recommended. See PostgreSQL
     documentation about "trust":
     https://www.postgresql.org/docs/current/auth-trust.html
  </code></pre>
  
  <p>How can I fix it? There was no changes in <code>bitbucket-pipelines.yml</code> file which could be the reason of such error..</p>