chore: bump to alpine 3.11

Author: palmerabollo

Dockerfile

@@ -1,15 +1,15 @@
-FROM golang:1.13.6-alpine3.10 as build
+FROM golang:1.13.8-alpine3.11 as build
 
 RUN echo "@edge http://dl-cdn.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories
-RUN echo "@edgecommunity http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories  
+RUN echo "@edgecommunity http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories
 RUN apk add --no-cache alpine-sdk 'librdkafka@edgecommunity>=1.3.0' 'librdkafka-dev@edgecommunity>=1.3.0'
 
 WORKDIR /src/prometheus-kafka-adapter
 ADD . /src/prometheus-kafka-adapter
 
 RUN go build -o /prometheus-kafka-adapter
 
-FROM alpine:3.10
+FROM alpine:3.11
 
 RUN apk add --no-cache librdkafka