build: Support arm64 container and add containerized build target

[pingleig]

Description of the issue

The Dockerfile is hard coded to use amd64 binary, we should determine it at runtime or let build context specify it.

Description of changes

• Use TARGETARCH arg from docker buildx or fallback to dpkg --print-architecture
• Add two new Dockerfiles to build from local deb file or the source code
• Change base builder image from Debian to Ubuntu because there is no official release for Debian arm64

License

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Tests

cd amazon-cloudwatch-container-insights/cloudwatch-agent-dockerfile
docker build .

# make sure you have access to go mod proxy,  some organization block it in corp network
make dockerized-build
# If you have the repo with vendor folder,  run the following instead, go mod proxy access is not required
make dockerized-build-vendor

For multi arch build, make sure you have docker buildx, you need to use the edge version instead of the stable one.

cd amazon-cloudwatch-container-insights/cloudwatch-agent-dockerfile
docker buildx create --name multi-builder
docker buildx use multi-builder
docker buildx build --platform linux/amd64,linux/arm64 .