DEVOPS-423 Change node-parachain to a public docker repository

[vukomir]

Proposed changes

move docker image hosting to public ECR

Type of change/Merge

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• Release
  • Increase versions
  • Baseline tests passed
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    • Major release
    • Minor release
    • Patch release

Checklist

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• Verify First, Write Last: In Substrate development, it is important that you always ensure preconditions are met and return errors at the beginning. After these checks have completed, then you may begin the function's computation.

Further comments