Add crane and jq to image

kaniko/Dockerfile

@@ -4,6 +4,8 @@ FROM gcr.io/kaniko-project/executor:v1.7.0-debug AS kaniko-src
 # https://github.com/GoogleContainerTools/kaniko/issues/960#issuecomment-573160390
 RUN cp -r /kaniko /kaniko-dist
 
+FROM gcr.io/go-containerregistry/crane as crane
+
 FROM alpine/git
 
 # See https://github.com/GoogleContainerTools/kaniko/blob/master/deploy/Dockerfile#L65-L70
@@ -17,4 +19,10 @@ ENV SSL_CERT_DIR=/kaniko/ssl/certs
 ENV DOCKER_CONFIG /kaniko/.docker/
 ENV DOCKER_CREDENTIAL_GCR_CONFIG /kaniko/.config/gcloud/docker_credential_gcr_config.json
 
-ENTRYPOINT ["/kaniko/executor"]
+RUN apk add --no-cache jq
+COPY --from=crane  /ko-app/crane /usr/local/bin/crane
+
+# Copy entry point
+COPY entry_point.sh /root/entry_point.sh
+
+ENTRYPOINT ["/root/entry_point.sh"]

kaniko/entry_point.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+if [ -z "$BUILD_IMAGE_NO_MESSAGE" ]; then
+    echo "You are using a GitLab CI build-image with kaniko and crane"
+    echo "You can suppress this message by setting BUILD_IMAGE_NO_MESSAGE"
+
+    /kaniko/executor version
+    echo "Crane version: $(crane version)"
+fi
+
+if [ -z "$BUILD_IMAGE_NO_AUTO_LOGIN" ]; then
+    if [ -n "$CI_REGISTRY_USER" ] && [ -n "$CI_REGISTRY_PASSWORD" ] && [ -n "$CI_REGISTRY" ]; then
+        echo "Logging into GitLab CI registry ($CI_REGISTRY)"
+        echo "You can suppress this behavior by setting BUILD_IMAGE_NO_AUTO_LOGIN"
+        crane auth login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" "$CI_REGISTRY"
+    fi
+fi
+
+if [ -z "$1" ]; then
+    sh
+else
+    exec "$@"
+fi