Container support for freyja_apps

[devkelley]

This PR adds container support for Example Freyja applications. This PR does the following:

• Add an ibeji-adapter freyja example application that connects with Ibeji but does not communicate with the cloud.
• Adds Dockerfile.freyja_apps that will be used by any Example Freyja Applications to containerize them.
  • The dockerfile defaults to the in-memory example application.
• Updates the ibeji-adapter to allow for containerization with outbound requests to localhost using a DNS alias.
• Add how to run in a container to README files for supported example applications.
• Add .env files for containers.
• Add README explaining what Dockerfile to use in the new container folder.

Validated that the containers work with Podman and Docker and can communicate with Ibeji and the mixed sample provider.

[ashbeitz]

Just minor comments. Please take a look.

[wilyle]

out of scope for this PR but something we should think about: we're starting to just go through permutations of adapters in this repo. It might be valuable to find a way to have a single app here that selects adapters based on config

[wilyle]

though this would likely mean all of the adapters have to be statically linked, which is less than ideal

[wilyle]

The Alex Recommends workflow doesn't work for forks so we're okay to check in without that passing since it's doing non-functional checks. I am going to do the cargo update to fix the security audit now to resolve that workflow

[ashbeitz]

Approved.