Deploy Multi-Architecture Docker Images with Buildkite on GCP C4A Arm VM

[odidev]

1. Provision an Arm-based SUSE SLES virtual machine on Google Cloud (C4A with Axion processors)
2. Install and configure Docker, Buildx, and the Buildkite agent
3. Write a Dockerfile to containerize a simple Flask-based Python app
4. Configure a Buildkite pipeline to build multi-architecture Docker images and push them to DockerHub
5. Run and validate the application to ensure it works as expected

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  Signed-off-by: odidev odidev@puresoftware.com