MingW CI builds are unstable

[strk]

What is the bug or the crash?

Infrastructural bug: MingW64 Windows 64bit Build workflow fail for reasons unrelated to the changes being proposed.
Example:

https://github.com/qgis/QGIS/actions/runs/6505888414/job/17670371699?pr=54923#step:13:26914

make[2]: write error: stdout

Steps to reproduce the issue

File a PR, wait for CI to complete, be unlucky enough to hit this

Versions

N/A

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response

[strk]

Here's a visualization of all runs of the subject mingw workflow:
https://github.com/qgis/QGIS/actions/workflows/mingw64.yml

it gives a feel of how many pull requests are going to be blocked by this.

[strk]

Given the error we saw is an error in writing to stdout, I suspect less verbose build will help here, refer to #54924

[lnicola]

Another interesting bit, not very relevant, since it also appears in the passing builds:

2023-10-13T09:56:17.1991018Z   The file
2023-10-13T09:56:17.1991216Z 
2023-10-13T09:56:17.1991625Z     /usr/x86_64-w64-mingw32/sys-root/mingw/bin/python3.11-config
2023-10-13T09:56:17.1992086Z 
2023-10-13T09:56:17.1992488Z   is readable but not executable.  CMake is using it for compatibility.

[strk]

It looks like those builds became more stable:
https://github.com/qgis/QGIS/actions/workflows/mingw64.yml

Dunno if it's thanks to PR #54924 or what else, but I'll close this ticket and we can reopen if needed.