title: alpine package py-pip missing
body: <p>Im trying to install python pip in my alpine using Docker compose file but get the following error.</p>
  
  <pre><code>ERROR: unsatisfiable constraints:
    py-pip (missing):
      required by: world[py-pip]
  ERROR: Service 'web' failed to build: The command '/bin/sh -c apk add py-pip' returned a non-zero code: 1
  </code></pre>