[ISSUE] fix docker install bug

[GoodMan-1]

When I use docker/build.sh, I met some problems, and I solved it.
@Lunderberg - CI, Vulkan backend @YuchenJin @antinucleon

[Lunderberg]

Thank you for the contribution, and these changes look good overall to me! Just a small nitpick from me.

[Lunderberg]

Can you add a comment describing which key this is, why it needs to be added? Searching for the key finds this stackoverflow post, suggesting that it is related to kitware/cmake key, but it would be good to have that information in the file as well.

[GoodMan-1]

Sorry, When I use this Dockerfile to build docker image, I met this error:

Err:7 https://apt.kitware.com/ubuntu bionic InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6AF7F09730B3F0A4
So, I add this
RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6AF7F09730B3F0A4
in dockrfile, and solved this error.

[Lunderberg]

@driazati The #10525 only rebuilds the docker images that are used as part of CI. Do we want to automatically build the demo docker images as well to avoid similar issues?

[driazati]

@driazati The #10525 only rebuilds the docker images that are used as part of CI. Do we want to automatically build the demo docker images as well to avoid similar issues?

good point, we would need some better infra since the conditioning code is kind of a mess, but I would be in favor of rebuilding the demo images only when their specific Dockerfiles are edited (and also maybe continually with some cadence, maybe weekly) just because they seem to rarely get updates

[Lunderberg]

@driazati That would make sense to me, since the demo images aren't needed as frequently, and would primarily be updated alongside the demo itself.