Install certificate in the docker image for secured https connection (#…

…13)

* add ca certificate to the docker image to make secured connection

Dockerfile

@@ -1,6 +1,9 @@
 FROM debian:latest AS builder
 LABEL maintainer="[email protected]"
 
+# add ca certificates for http secured connection
+RUN apt-get update && apt-get install -y ca-certificates && rm -rf /var/cache/apk/*
+
 # copy the binary
 WORKDIR /root/  
 ARG GO_BINARY