Thanks, @burki. Since i struggled a bit myself with referencing the certificate, here my working gitlab-ci.yml:
include:
- remote: "https://gitlab.com/renovate-bot/renovate-runner/-/raw/v24.0.0/templates/renovate.gitlab-ci.yml"
variables:
SELF_SIGNED_CERTIFICATE_PATH: "${CI_PROJECT_DIR}/certificates/my-cert.pem"
renovate:
variables:
NODE_EXTRA_CA_CERTS: $SELF_SIGNED_CERTIFICATE_PATH
GIT_SSL_CAINFO: $SELF_SIGNED_CERTIFICATE_PATH