Accept arguments after -- in 'dev_cli.sh shell' and forward them
to 'bash -c' inside the container. When no arguments are given,
an interactive shell is started as before. This enables running
one-off commands in the CI container without an interactive session,
for example:
./scripts/dev_cli.sh shell -- rustup toolchain install nightly \&\& cargo +nightly fmt --all -- --check
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
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