[inginious-installer] Fails to install the latest pyjavacpp grading container

[nrybowski]

The installer throws the following error when one try to install the pyjavacpp container:

[...]
Indicate the name of a container to build, or press enter to continue []: pyjavacpp
(INFO) Ok, I'll build container pyjavacpp
(INFO) Container pyjavacpp requires container ingi/inginious-c-cpp, I'll build it too.
(ERROR) An error occurred while copying the directory: [Errno 2] No such file or directory: '/tmp/tmp8t9s8wht/grading/ingi/inginious-c-cpp/Dockerfile'

The ingi/inginious-c-cpp grading container has been previously installed with the same script and is available in docker:

$ docker images
REPOSITORY                 TAG       IMAGE ID       CREATED        SIZE
ingi/inginious-c-cpp       latest    dcf99f5b6ca3   3 hours ago    1.71GB
<none>                     <none>    6535507ccb5c   3 hours ago    685MB
ingi/inginious-c-default   latest    ef0f7226a128   3 hours ago    685MB
ingi/inginious-c-base      latest    189d0cdc489b   3 hours ago    685MB
rockylinux                 8         c830f8e8f82b   3 months ago   205MB

It might also be interesting to first look if the dependency is available in docker before trying to rebuild it from scratch.