Bug#1112076: gcr4: autopkgtest is flaky and gets stuck for hours

[Luca Boccassi]

Source: gcr4
Severity: serious
Justification: flaky autopkgtest are RC as per RT and block other packages

Dear Maintainer(s),

The gcr4 autopkgtests seem to get stuck for hours until timing out in
the installed-tests test. This stops other packages from migrating.

Examples:

https://ci.debian.net/packages/g/gcr4/unstable/amd64/63116467/
https://ci.debian.net/packages/g/gcr4/unstable/arm64/62528382/
https://ci.debian.net/packages/g/gcr4/testing/ppc64el/63386260/
https://ci.debian.net/packages/g/gcr4/testing/ppc64el/63377735/
https://ci.debian.net/packages/g/gcr4/testing/riscv64/63387016/
https://ci.debian.net/packages/g/gcr4/testing/riscv64/63707741/