2025.1.0a3 Multiarch Docker Images

Refactor Docker build workflows and remove reusable workflow

Deleted the reusable build-docker-linux.yml workflow and inlined its steps directly into deploy-docker-linux.yml and docker-linux-CI.yml. Both workflows now explicitly define Docker build and push steps, and support multiple platforms. This simplifies workflow management and removes the need for matrix builds and workflow_call inputs.