Implement CI/CD workflows for Initia binary builds - Add build-and-upload.yml: Main workflow coordinating build processes * Set up matrix strategy for multiple platforms (Linux, Darwin) * Trigger builds for amd64 and arm64 architectures - Add build-darwin-amd64.yml and build-darwin-arm64.yml: Darwin-specific build workflows * Configure macOS environment and build process * Support amd64 and arm64 architectures separately - Add build-linux-amd64.yml and build-linux-arm64.yml: Linux-specific build workflows * Set up Ubuntu environment and build process * Include steps for amd64 and arm64 builds separately - Implement automatic uploads to GitHub Releases for all builds - Add verification steps for built binaries This commit sets up comprehensive CI/CD pipelines for building Minievm binaries across multiple platforms and architectures, ensuring consistent and automated releases.