Update add

Dockerfile

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+
+FROM golang:1.13-alpine as certs
+RUN apk update && apk add --no-cache ca-certificates
+
+FROM busybox:glibc
+RUN mkdir -p /var/log
+WORKDIR /main
+COPY --from=certs /etc/ssl/certs /etc/ssl/certs
+
+COPY . .
+
+ENV GOPATH=""
+ENV MNT="/mnt/"
+ENTRYPOINT ["/main/exec-rssmon3"]
+CMD []
+