Just did a successful build with this manifest:
<manifest>
<remote fetch="https://github.com/" name="github2" />
<project name="LineageOS/android_device_fairphone_FP2" path="device/fairphone/FP2" remote="github2" revision="cm-14.1" />
<project name="LineageOS/android_kernel_fairphone_msm8974" path="kernel/fairphone/msm8974" remote="github2" revision="cm-14.1" />
<project name="FairBlobs/proprietary_vendor_fairphone-fork" path="vendor/fairphone" remote="github2" revision="cm-14.1" />
<project name="lineageos/android_device_qcom_common" path="device/qcom/common" remote="github2" revision="cm-14.1" />
</manifest>
See: https://fp2.joutubes.nl/jenkins/job/FP2-LineageOS14.1/24/
Starting a new build with the old keys (OTA signing) and OTA url, so this will work again. I will test the zip tomorrow and then push the semi-official release over OTA if everything looks great!