Use pre-built ctags + build arm64 Docker images

[kokes]

While investigating the option of making zoekt Docker builds multi-platform (arm64 and am64, not just amd64), I ran into a few virtualization problems, so decided to tackle the problem in a slightly different way than just plain qemu.

• changed universal ctags installation from building from source to using prebuilt binaries
  • bumped the universal ctags version quite a bit - there are prebuilt binaries for the ~2024 version that was there previously - happy to move it back if you so wish - ended up using it as newer version have slight changes in their data structures, so decided not to conflate too many things here
• Go builds are now cross platform within Docker - meaning that even with QEMU, Docker runs Go builds natively, but compiles for both platforms - it then switches to virtualized targets and copies over the static Go binary from the previous step - this leverages the lack of CGO and makes things fast and efficient. Combined with ctags installed through APKs, there are no virtualized builds.
• added a CI timeout that was previously missing (a good safeguard against runaway builds)

Supersedes #1129

[kokes]

Looking into the test failure - may be due to the newer ctags version

Edit: looks like the tests work again after moving the release back to early 2024

[keegancsmith]

Thanks!! Two minor inline comments then I can land.

[kokes]

@keegancsmith addressed both

[keegancsmith]

Thanks!