Container Image Enhancements

Use Multi=Stage Builds to get certificats
Use scratch as base image to reduce size and attack surface

Dockerfile

@@ -1,7 +1,8 @@
-FROM alpine
+FROM alpine as build
 
-RUN apk add --no-cache ca-certificates
+RUN apk add --update --no-cache ca-certificates
 
+FROM scratch
+COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 COPY github-weather /bin/github-weather
-
-ENTRYPOINT ["/bin/github-weather"]
+ENTRYPOINT ["/bin/github-weather"]