Description

This fixes some Docker related issues introduced in #890:

• add libexpat1 to Dockerfile runtime dependencies (required by pyuwsgi)
• healthcheck now hits uWSGI stats endpoint (port 1717) instead of uWSGI protocol socket (port 8001)
• only load django_watchfiles when DJANGO_TEST_SERVER=True, not just DEBUG=True
• add die-on-term to uWSGI config for clean container shutdown

The first two actually caused the failed starts. I missed these in #890 because I made wrong assumptions during testing. Hope this will fix it.

Related issues

#898

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