Hosted Gitlab Runner running out of disk space

Since this week a gitlab ci job for on of my projects keeps failing since the machine is running out of disk space. We have a Gitlab Premium plan and are using the hosted Gitlab offering incl. the hosted runners.

Because of the build time we are already using the large runner (last failure was with

The pipeline itself builds a multistage Docker container where the individual stages are compiling different software projects from source. I have checked the output of df -h at the beginning of the build and it seems the runners only have about 15gb of free disk space.

Is there a way to increase disk space?

I opened a support ticket and was pointed at

If anybody else could make use of it please upvote as well.