Signed-off-by: Stephan Linz <[email protected]>

In preparation for a differentiated CI pipeline, the Dockerfile
can now be used with finer-grained multi-stages to build multi-
platform Docker images.

ubuntu:noble-20240904.1
|
`–[base]
   | - Ubuntu system package upgrades
   | - Ubuntu APT software management utils
   | - Ubuntu localization for 'en_US.UTF-8' and 'de_DE.UTF-8'
   | - TSN workspace user in '/home/tsn' ('UID=1005' and 'GID=205')
   | - Set main entry point to '/bin/bash'
   | - Switch to TSN workspace user in '/home/tsn'
   |
   `–[asdf-all]
     | - Ubuntu system packages for ASDF
     | - Install ASDF
     | - Install ASDF Plugin Manager
     | - Switch to TSN workspace user in '/home/tsn'
     |
     +–[asdf-amd64]
     | | - Empty, nothing to do.
   ,–:–´
   | |
   | +–[asdf-arm]
   | | | - Empty, nothing to do.
   +–:–´
   | |
   | +–[asdf-arm64]
   | | | - Empty, nothing to do.
   +–:–´
   | |
   | +–[asdf-riscv64]
   | | | - Empty, nothing to do.
   +–:–´
   | |
   | +–[asdf-ppc64le]
   | | | - Empty, nothing to do.
   +–:–´
   | |
   | `–[asdf-s390x]
   |   | - Empty, nothing to do.
   +–––´
   |
   `–[asdf]:
       - Verify ASDF, execute CLI.
       - Verify ASDF Plugin Manager, execute CLI.

Signed-off-by: Stephan Linz <[email protected]>

Only the instructions RUN, COPY, and ADD create layers. Other
instructions create temporary intermediate images, and do not
increase the size of the build (number of layers). However,
there is a limit of 127 layers in the final image. It is
therefore recommended to offer Dockerfiles in which the number
of layers created has been reduced.

Always combine RUN apt-get update with apt-get install in the
same RUN statement is a common way to do so. For details, see:

- https://emmer.dev/blog/reducing-docker-layers
- https://docs.docker.com/build/building/best-practices/#run

Test with:

  docker inspect tiacsys/tsn-asdf-ws:local | \
         jq '.[0].RootFS.Layers[]' | wc -l

Possible to squash:

  docker image save tiacsys/tsn-asdf-ws:local | \
  docker import - tiacsys/tsn-asdf-ws:squash && \
  docker inspect tiacsys/tsn-asdf-ws:squash | \
         jq '.[0].RootFS.Layers[]' | wc -l

Signed-off-by: Stephan Linz <[email protected]>

Use our own reusable GitHub workflows for Docker from:

- tiacsys/github-workflows/.github/workflows/docker-stages.yml@v1
- tiacsys/github-workflows/.github/workflows/docker-retention.yml@v1

Use our own reusable GitHub workflows for Retry on Failure from:

- tiacsys/github-workflows/.github/workflows/retry-workflow.yml@v1

Signed-off-by: Stephan Linz <[email protected]>

Signed-off-by: Stephan Linz <[email protected]>

Use 'latest' image from https://hub.docker.com/_/ubuntu with the
specific tag 'noble-20241011'.

Signed-off-by: Stephan Linz <[email protected]>

Signed-off-by: Stephan Linz <[email protected]>