build-pr CI reporting failure with BUILD SUCCESSFUL

[psymoon]

Both PRs build locally fine and CI build status returns successful:

#2992 - https://firefox-ci-tc.services.mozilla.com/tasks/b3ct4GIvQHWgFuqM8fMKFg/runs/0/logs/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2Fb3ct4GIvQHWgFuqM8fMKFg%2Fruns%2F0%2Fartifacts%2Fpublic%2Flogs%2Flive.log

#2994 - https://firefox-ci-tc.services.mozilla.com/tasks/H_we66fYRQ60_aR03O5JBA/runs/0/logs/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FH_we66fYRQ60_aR03O5JBA%2Fruns%2F0%2Fartifacts%2Fpublic%2Flogs%2Flive.log

[task 2020-06-25T14:42:58.111Z] BUILD SUCCESSFUL in 1m 27s
[task 2020-06-25T14:42:58.111Z] 31 actionable tasks: 20 executed, 11 up-to-date
[task 2020-06-25T14:42:58.428Z] + ./tools/taskcluster/upload-coverage-report.sh
[task 2020-06-25T14:42:58.429Z] + python tools/taskcluster/get-codecov-token.py
[task 2020-06-25T14:42:58.643Z] Imported codecov token from secrets service.
[task 2020-06-25T14:42:58.645Z] + bash /dev/fd/63 -t @.codecov_token
[task 2020-06-25T14:42:58.645Z] ++ curl -s https://codecov.io/bash
[taskcluster:error] Task timeout after 7200 seconds. Force killing container.
[taskcluster 2020-06-25 16:29:05.649Z] === Task Finished ===
[taskcluster 2020-06-25 16:29:05.649Z] Unsuccessful task run with exit code: -1 completed in 7200.913 seconds