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Add Debian Buster image with 32-bit libraries

debian:buster:ia32:docker CI image is based on amd64 Debian Buster, but
has additional 32-bit libraries necessary to cross-compile BIND in
32-bit.

As the image name consists of VENDOR-VERSION-ARCH triplet, ARCH needs to
be set to something else than amd64 (we already have
debian-buster-amd64), or i386 as that is misleading, because this image
is not based on i386 Docker image. ia32 ARCH is chosen for this type of
image.

As ia32 is not a standard Docker architecture, it needs to be stripped
from SOURCE_IMAGE variable.

Special variables were added to install 32-bit libraries of DNSTAP
dependencies and the libedit library.