[Feature]: Publish Enarx OCI images

[rvolosatovs]

Is there an existing issue for this?

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Description

Our CI already builds OCI images containing Enarx for different platforms, we should publish them. We probably want to use Docker Hub, but perhaps @npmccallum has different opinion here. We could also publish to several registries.

Acceptance Criteria

No response

Suggestions for a technical implementation

Add credentials to CI and push as part of CI/CD pipeline

[npmccallum]

@rvolosatovs Is there a reason not to publish to the github registry?

[puiterwijk]

For the record: Docker hub credentials are available in this repo as repository secrets.