docker: Do not ignore certain git folder for docker build

[mmacata]

For docker alpine build, this fix prevents the following error during GRASS GIS configure step:
checking for GRASS GIS headers commit date... fatal: bad object HEAD 2024-12-10T08:46:00+00:00

With this fix it correctly returns:
checking for GRASS GIS headers commit date... 2024-11-29T10:01:48+00:00

[echoix]

Can you confirm (not out of all reasonable doubts, but only probably) that the final image stage isn't really bigger now, ie, it includes the pack folder inside .git, since it isn't ignored anymore. Check that .git/objects/pack isn't leaked into the final stage of the image. The pack files can contain the vast majority of the git repo's size.

In both cases, it will be ok to merge.

[mmacata]

Ah good point!

The alpine build uses multistage and I can confirm that the size is not increased.

Ubuntu also uses multistage-build so I strongly assume this is also fine.

The debian build is not using multistage, so I ran a local comparison and indeed, the size is increased by around the size which the .git/objects/pack has (3.29GB vs 2.93GB for osgeo/grass-gis:main-debian). The folder itself is not included in the final debian image though because of this line which unfortunately has no effect on the image size.

[echoix]

Ok. Fine with me since we know the limitations

You're right with the Debian images, these three lines indeed do nothing, as it is an extra layer that removes files, the files are still there. We should either clean up by copying stuff out of a layer, or more easily, always clean up (delete files) in the same step they were added.

[echoix]

@mmacata Also, did you have the chance to think about #3821 since the community sprint?

[mmacata]

@mmacata Also, did you have the chance to think about #3821 since the community sprint?

Ups, I somehow lost sight of that, will do that in the next days!