Docker support

[mathisloge]

related #3704 and #4153

What functionalities are added by this PR?

• builds with cmake and leaves the dev packages in so that e.g. node-mapnik can directly build with the docker image. I have made an example here: Enable all platforms again  node-mapnik#976 or use pkg-config as an alternative node-mapnik#980
• github workflow: publishes the docker images into the github registry. See: https://github.com/mathisloge/mapnik/pkgs/container/mapnik . So this branch is labeled ghcr.io/mathisloge/mapnik:docker and later ghcr.io/mapnik/mapnik:docker

Pinging some people that were interested in the past: @knutole @hiddewie @jawg @Joxit

maybe we can work together or leave some reviews. I'm not a mapnik docker user myself

[Joxit]

Hi there,
Are you sure this will work with GA ? Is there no time limit for a running workflow ? IIRC, building mapnik takes time 😅

[mathisloge]

hi @Joxit
it has already runned :D https://github.com/mathisloge/mapnik/runs/4214019688?check_suite_focus=true

But the limits for open source projects are actually quite high. each job can take up to 6 hours and a workflow up to 72 hours https://docs.github.com/en/actions/learn-github-actions/usage-limits-billing-and-administration

But the workflow only takes ~15 mins . so it is quite ok

[Joxit]

Oh, nice ! I will add GA on jawg/docker-mapnik3 then 😄

[mathisloge]

@artemp this should be ready to merge. There shouldn't be any actions needed other than a merge. The workflow would use the github context to get the secrets / repo names.

Each branch will have its own docker tag
Each tag labeled with v*.*.* will have its own docker tag.
The latest semver will get the latest docker tag

You can see some example tags here:
https://github.com/mathisloge/mapnik/pkgs/container/mapnik

Note, that this uses the cmake build. For node-mapnik or python-mapnik I will now find a way to use pkg-config instead of mapnik-config.

Or is there a desire to use SCons to build mapnik on the Docker image?

[mathisloge]

@hiddewie thanks for your reviews. I've added more dirs to the ignore list. So it is reduced to 33MB.
and splitted the commands as suggested.

[zy6p]

Looking forward to see this PR merged. This will help with some custom plugins we created.

[mathisloge]

@zy6p you could actually use the containers already. https://github.com/mathisloge/mapnik/pkgs/container/mapnik/10503672?tag=docker

[zy6p]

@zy6p you could actually use the containers already. mathisloge/mapnik/pkgs/container/mapnik/10503672?tag=docker

Great! My laptop is M1 mac, and pre-build mapnik doesnot support arm. But these containers can work 😃