We can not increase the ulimit from inside the job, instead we need to
tell forgejo (via /opt/forgejo-runner/data/config.yml) to include
e.g. "--ulimit memlock=-1" in container options if necessary.
This did not appear to help things however.
This reverts commit 2be4c8ea13.
Currently the build hangs i SLASH/ tests.
Build output where it hangs:
```
make check-TESTS check-local
1338
make[3]: Entering directory '/tmp/slash/src'
1339
make[4]: Entering directory '/tmp/slash/src'
1340
PASS: fellow_cache_test_ndebug
```
The binary that is hanging: ./fellow_cache_test
