CI: Cover repo errors with exponential retries

https://app.circleci.com/pipelines/github/os-autoinst/openQA/14088/workflows/38f48aa9-d43f-4d94-aa34-125ce4857a7a/jobs/132716

shellcheck -x $(file --mime-type script/* t/* container/worker/*.sh tools/* | sed -n 's/^\(.*\):.*text\/x-shellscript.*$/\1/p')

In tools/test_containers_compose line 5:
thisdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" > /dev/null 2>&1 && pwd)"
^-----^ SC2034 (warning): thisdir appears unused. Verify use (or export if used externally).

For more information:
  https://www.shellcheck.net/wiki/SC2034 -- thisdir appears unused. Verify us...
make: *** [Makefile:302: test-shellcheck] Error 1

os-autoinst / openQA

CI: Cover repo errors with exponential retries #5789