tools/docker: fix multi-arch build for env image

The env Docker image currently fails to build on non-x86 architectures
because it attempts to install i386 libraries that are unavailable on
arm64.
Additionally, the monolithic apt-get command causes timeouts and dpkg
errors.

Fix the build by making i386 package installation conditional on amd64
and splitting the installation into smaller, more stable steps.

While at it, remove the sudo usage (not necessary, because Docker setup
is performed as root).

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