Despite successfully completing the given build and creating the output folder structure, lpcraft returned a non-zero return code due to a CalledProcessError while running `lxc exec readlink -f -z --`. The output artifacts were not copied out of the container.
If logs are to be believed, this is caused by a race between the return from the incomplete `lxc exec` and the call to `lxc stop` - note the call to `lxc exec` at 14:31:42.345, the call to `lxc stop` at 14:31:42.533, and the error at 14:31:44.086:
2022-03-02 14:31:42.037 Executing in container: lxc --project lpcraft exec local:lpcraft-typing-1942712-focal-amd64 -- env PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin find /root/project -mindepth 1 '!' -type d -printf '%P\0'
2022-03-02 14:31:42.208 Executing in container: lxc --project lpcraft exec local:lpcraft-typing-1942712-focal-amd64 -- env PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin readlink -f -z --
2022-03-02 14:31:42.345 Executing in container: lxc --project lpcraft exec local:lpcraft-typing-1942712-focal-amd64 -- rm -rf /root/project
2022-03-02 14:31:42.461 Executing on host: lxc --project lpcraft config device show local:lpcraft-typing-1942712-focal-amd64
2022-03-02 14:31:42.533 Executing on host: lxc --project lpcraft stop local:lpcraft-typing-1942712-focal-amd64
2022-03-02 14:31:44.086 lpcraft internal error: CalledProcessError(1, ['lxc', '--project', 'lpcraft', 'exec', 'local:lpcraft-typing-1942712-focal-amd64', '--', 'env', 'PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin', 'readlink', '-f', '-z', '--'])
2022-03-02 14:31:44.089 Traceback (most recent call last):
...<snipped>
Full log attached for details.
This bug appears to be a consequence of there being no files located in the expected output location. So it is not a race after all but perhaps just could use some helpful error text