memcached enabled and 'Error: no memcache module found'

[anders-larsson]

Describe the bug

When memcached is enabled container fails with Error: no memcache module found. Can be fixed creating a new container based on this with RUN pip install python-memcached. However, since no one else has complained about this I'm not sure if this is just user error.

Puppetboard version

Tested in with 5.1.0 and 5.3.0. Happens with both versions.

Environment and installation method

docker compose:

puppetboard:
  ...
  environment:
    - ENABLE_CLASS=True
    - SCHEDULER_ENABLED=True
    - CACHE_TYPE=MemcachedCache
    - CACHE_MEMCACHED_SERVERS=memcached:11211

[lcharreau]

One of the required packages (pymemcache, python-memcached, or pylibmc) is missing from the requirements.txt file.