Change container image build workflow to create multi-architecture images

[triggan]

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Graph Notebook Version (and Graph Database and Version used if applicable)
N/A

Is your feature request related to a problem? Please describe.
As of the time of this issue, the Graph Notebook project has a build workflow that creates and publishes a container image in the AWS ECR Public Gallery with only a AMD64 supported architecture. This image can only be used on ARM-based machines (Apple M1/M2, Amazon Graviton, etc.) via the use of emulation, which can have stability issues.

Describe the solution you'd like
The request here is to change the build/publish workflow to create a multi-architecture image that supports both AMD64 and ARM64 architectures.

Additional context
N/A

[triggan]

Adding link to docs on multi-platform image builds using buildx, for later review: https://docs.docker.com/build/ci/github-actions/multi-platform/