TF-M: revert to use semicolon separator in the RUN command

revert https://review.trustedfirmware.org/c/ci/dockerfiles/+/6672
It was working as expected, as long as we keep "set -e" in the RUN
command.

Split toolchains and binaries install into a shell script. it's easier to
read and maintain a shell script than bundle it into a Dockerfile.

Signed-off-by: Fathi Boudra <fathi.boudra@linaro.org>
Change-Id: Ib0d0dfd26c7ef3602547113a5172c1021c9e3ac2
2 files changed