docker: mount source and resources as read-only (#1724)HEADriscv-isa-release-b796659-2024-11-14main

This avoids writing output files into the source tree by changing the
imagesoutdir variable to point at the build tree. We can bind mount
source and docs-resources as read-only into the build directory and
then create symlinks to ensure the docker container sees the
appropriate directory layout.

Note: imagesoutdir must be an absolute path since otherwise
asciidoctor-mathemtical interprets it as a path relative to the source
dir rather than the current working directory (asciidoctor-diagram does
the expected thing and interprets it relative to the cwd).

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