Use cortexlabs's version kubexit to address death dependencies (#2260)

Author: vishalbollu

images/kubexit/Dockerfile

@@ -1 +1,15 @@
-FROM miguelvr/kubexit:0.3.2-patch
+# This file has been adapted from https://github.com/cortexlabs/kubexit
+FROM golang:1.14.1-alpine3.11 AS builder
+RUN apk update && apk upgrade && \
+    apk add bash git openssh
+
+RUN mkdir /tmp/kubexit
+RUN git clone -b v0.1.0-cortex --depth 1  https://github.com/cortexlabs/kubexit.git /tmp/kubexit
+
+WORKDIR /tmp/kubexit
+RUN CGO_ENABLED=0 GOOS=linux go build -o kubexit ./cmd/kubexit
+
+FROM alpine:3.11
+RUN apk --no-cache add ca-certificates tzdata
+COPY --from=builder /tmp/kubexit/kubexit /bin/
+ENTRYPOINT ["kubexit"]