Upgrade docker images and GitHub action versions. Pin to ubuntu-22.04

[charlesomer]

Hi, just a few updates to the docker stuff, feel free to decline this PR though if you'd rather bump things manually! This currently fixes the GitHub Actions too (at least it works in my repo anyway 😆).

• Activate pipelines again.
• Pin worker to ubuntu-22.04 instead of ubuntu-latest: Segment fault with Ubuntu 24.04 20250120.5.0 actions/runner-images#11471
• Docker RUN - split install of packages and file modifications.
• Version upgrades for GitHub Actions.
• Upgrade docker build image from alpine:3.17 to alpine:3.20.
• Upgrade final docker image from crazymax/alpine-s6:3.17-3.1.1.2 to crazymax/alpine-s6:3.20-3.2.0.2.
  • This also upgrades S6 to 3.2.0.2.
  • Alpine 3.20 requires manual bump of libressl3.6-libcrypto to libressl3.8-libcrypto.
  • This will inevitably change the versions of other packages inside the image too, my use case appears to work without issue but this may require more testing to make sure?
• Add -j $(nproc) to RUN make commands in Dockerfile.

Thank you 😄

[mikebrady]

Hi Charles. Thanks for this! I have indeed been struggling with the pipelines. I'll take a look.

[mikebrady]

Thanks again, Charles.