Docker 26+ does not allow .git/ to be copied onto the image

[jacobwod]

It seems as recent Docker version requires us to change the way we build our images. I get this message, across both macOS and Linux:

I confirmed this did not happen (in our repo) on Docker < 26.0.0.

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Here's a similar problem someone else is facing: https://stackoverflow.com/questions/66680559/docker-unable-to-copy-git-folder.

The proper way to solve this could be saving the Hajk version number and most recent commit hash into a file, rather than parsing it on-the-flight, as we currently do in https://github.com/hajkmap/Hajk/blob/49f36f5099cc8914c2947c1eb21e6f3011d35de0/apps/client/prebuild.js.

But that's for the Docker build. Ideally, we must find a solution that works for usual npm run build too. Ideas @hajkmap/dev?

[jacobwod]

Looks like it can be solved by properly pointing to the directory (using trailing slash).