Update Linux build container (Golang 1.21.3 and Rust 1.75)

[faern]

This change is 

[faern]

Reviewable status: 0 of 2 files reviewed, all discussions resolved

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building/README.md line 36 at r1 (raw file):

# Pushes the new sigstore entry
GIT_SSH_COMMAND="ssh -i /path/to/deploy-key" git push

FYI: The build server has a bunch of ssh credentials. And by default ssh does not use the deploy key for this repository. So we need to explicitly tell it to do that. I forget this on every new container build and need to figure out what's wrong. Adding it to the docs should save some time.

[albin-mullvad]

Reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved

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building/README.md line 36 at r1 (raw file):

Previously, faern (Linus Färnstrand) wrote…

FYI: The build server has a bunch of ssh credentials. And by default ssh does not use the deploy key for this repository. So we need to explicitly tell it to do that. I forget this on every new container build and need to figure out what's wrong. Adding it to the docs should save some time.

Sounds good 👍

[albin-mullvad]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @faern)

a discussion (no related file):
Might be nice to bump android image in the same PR 🤔

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[albin-mullvad]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @faern)

a discussion (no related file):

Previously, albin-mullvad wrote…

Might be nice to bump android image in the same PR 🤔

Basically combining this PR with the following PR since it's a bit incomplete otherwise: #5649

One example is that some desktop workflows should be bumped to use the same rust version as the container.

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[faern]

Superseded by #5559