Update alpine version

pkg/login-validator/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:alpine as gobuild
+FROM golang:1.17-alpine3.15 as gobuild
 
 RUN apk add --no-cache git
 
@@ -9,7 +9,7 @@ ADD cmd ./
 RUN go build -v -ldflags="-s -w" -o login-validator
 
 
-FROM alpine
+FROM alpine:3.15
 MAINTAINER Pierre-Olivier Mercier <nemunaire@nemunai.re>
 
 EXPOSE 8081