Allow [runners.kubernetes.volumes] configuration in the helm chart
When we reviewed !39 we found certain issues and came up with the following proposal:
- Allow user to specify config template gitlab-org/gitlab-runner!1263 (merged), this is required because right now all configuration was done through environment variables and things like volumes are not supported by environment variable since they are a complex structure.
- Start using config template for configuration generation !153
- Update !39 to use the configuration template instead.