Merge pull request #685 from ericchiang/add-openssl-to-docker-container

Dockerfile: add OpenSSL to Docker container

Dockerfile

 FROM alpine:3.4
 
+MAINTAINER Ed Rooth <ed.rooth@coreos.com>
 MAINTAINER Eric Chiang <eric.chiang@coreos.com>
+MAINTAINER Rithu John <rithu.john@coreos.com>
 
-RUN apk add --update ca-certificates 
+# Dex connectors, such as GitHub and Google logins require root certificates.
+# Proper installations should manage those certificates, but it's a bad user
+# experience when this doesn't work out of the box.
+#
+# OpenSSL is required so wget can query HTTPS endpoints for health checking.
+RUN apk add --update ca-certificates openssl
 
 COPY _output/bin/dex /usr/local/bin/dex
 
-ENTRYPOINT ["/usr/local/bin/dex"]
+ENTRYPOINT ["dex"]
 
 CMD ["version"]