See https://matrix.to/#/!XFYeWdFfIxGnMXYndI:kde.org/$p0S-FU4tU94BRND4wyT_-CvAa_k4k_RSWzIP-7zp_AA?via=kde.org&via=matrix.org&via=im.kde.org
This should resolve the invalid certificate error when running the bootstrap script.