Add +build-signed-extensions for BYOK k8s sysext signing - #798
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Integrate palette-sysext so UKI BYOK users can sign k8s systemd extensions with the same db key/cert pair used for the boot chain, closing the Secure Boot trust loop without relying on Spectro's extension certificate. Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
+build-signed-extensionsEarthly target that signs k8s systemd extensions (kubeadm,k3s,rke2,canonical) using the same UKI BYOKdb.key/db.pempair that signs the boot chainpalette-sysextCLI and extensions tree via new+palette-sysext-bintarget; run build insideWITH DOCKER(palette-sysext delegates todocker buildx+ auroraboot)~/.docker/config.jsonasDOCKER_AUTH_CONFIGsecret inearthly.shwhen--pushis used, so nested registry push works inside DinD.arg.templateTest plan
./earthly.sh +build-signed-extensionswith BYOK keys present produces tar(s) under./build/signed-extensions/./earthly.sh --push +build-signed-extensionspushes to$IMAGE_REGISTRY/palette-sysext-extensionsafterdocker login--DRY_RUN=trueprints palette-sysext commands without executingK8S_DISTRIBUTION=nodeadmis rejected with a clear errorMade with Cursor