remove signer from kaniko image

build-kaniko.jenkins

@@ -19,27 +19,11 @@ spec:
     tty: true
     command:
     - /busybox/cat
-  - name: alpine
-    imagePullPolicy: Always
-    image: ${repository}/library/alpine:latest
-    tty: true
-    command:
-    - /bin/sh
 """,
 ) {
     node (label) {
         def workspace = pwd()
 
-        stage ("Get CoSign") {
-            container ("alpine") {
-                sh """
-                    apk add --no-cache curl jq
-                    curl --silent --location "\$(curl --silent "https://api.github.com/repos/sigstore/cosign/releases/latest" | jq -r '.assets[0].browser_download_url')" --output "${workspace}/cosign"
-                    chmod +x "${workspace}/cosign"
-                """
-            }
-        }
-
         stage ("Prepare Kaniko") {
             container ("kaniko") {
                 withCredentials([usernameColonPassword(
@@ -78,7 +62,6 @@ spec:
         stage("Build Alpine with CA") {
             container("kaniko") {
                 def DF = """FROM gcr.io/kaniko-project/executor:debug
-COPY ./cosign /usr/local/bin/cosign
 COPY ./kaniko-chain.crt /kaniko/ssl/certs/ca-certificates.crt
 """
                 sh "cp /kaniko/ssl/certs/ca-certificates.crt \"${workspace}/kaniko-chain.crt\""