Update requirements and add container building GHA

[almahmoud]

• pyYAML<6.0 because of TypeError: load() missing 1 required positional argument: 'Loader' in yaml.load() for 6.0+
• [full] to cloudbridge to properly include all requirements
• Adds building and pushing workflow (I don't have permissions to add secrets for this repo, so docker creds will still need to be added)
  Existing image with these changes at almahmoud/cloudman-server:latest if you want to try it out first

[nuwang]

Thanks for fixing these, and great to see the docker build being fixed. One comment on pyyaml.

[nuwang]

I think if we do a search/replace of yaml.load with yaml.safe_load, we can use the latest pyyaml? I believe safe_load is recommended anyway.