fix AsyncAPI handling on Docker startup

[tomkralidis]

Overview

Follow on PR of #2220 to ensure Docker builds run as expected (with AsyncAPI being an optional capability).

Related Issue / discussion

#2146 #2220

Additional information

Thanks to @justb4 and the GeoQoS service for catching!

Dependency policy (RFC2)

• I have ensured that this PR meets RFC2 requirements

Updates to public demo

• I have ensured that breaking changes to the pygeoapi master demo server have been addressed
  • https://github.com/geopython/demo.pygeoapi.io/blob/master/services/pygeoapi_master/local.config.yml

Contributions and licensing

(as per https://github.com/geopython/pygeoapi/blob/master/CONTRIBUTING.md#contributions-and-licensing)

• I'd like to contribute [feature X|bugfix Y|docs|something else] to pygeoapi. I confirm that my contributions to pygeoapi will be compatible with the pygeoapi license guidelines at the time of contribution
• I have already previously agreed to the pygeoapi Contributions and Licensing Guidelines

[doublebyte1]

+1

[tomkralidis]

Fixed on demo: https://demo.geohealthcheck.org/resource/575