move oras snapcraft configuration to GitHub actions

[qweeah]

The snapcraft configuration contains detail about current version and Golang version. The version-specific detail should be removed from source code and injected during building.

Snapcraft file schema: https://snapcraft.io/docs/snapcraft-schema. Also, below actions can be used to build and publish:

• https://github.com/snapcore/action-build
• https://github.com/snapcore/action-publish

[shizhMSFT]

@qweeah Could you provide a link to the documentation on how to write a snapcraft configuration?

[github-actions]

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[github-actions]

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