CI: timeout during linking while cross-compiling x86_64 -> aarch64

From https://gitlab.postmarketos.org/postmarketOS/pmaports/-/jobs/1282622#L2346:

[936/936] Linking target src/core/NetworkManager
[19:39:42] Process did not write any output for 900 seconds. Killing it.

changed milestone to %Remaining issues after gitlab migration

mentioned in merge request pmbootstrap!2480 (merged)

added ci label

assigned to @craftyguy