corrects variable

build-cosign.jenkins

@@ -55,7 +55,7 @@ spec:
 
 		stage("Build Latest Alpine with CA") {
 			container("kaniko") {
-				def DF = """FROM ${registry}/library/alpine:latest as CERT_STORE
+				def DF = """FROM ${localRegistry}/library/alpine:latest as CERT_STORE
 FROM ${cosignRepository}:${cosignTag}
 
 COPY --from=CERT_STORE /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt