Updated Maintainer Email in Dockerfile

Dockerfile

@@ -1,6 +1,6 @@
 FROM golang:alpine AS builder
 
-MAINTAINER "Yoginth <yoginth@icloud.com>"
+MAINTAINER "Yoginth <yoginth@protonmail.com>"
 
 # Install build deps
 RUN apk --no-cache --no-progress add --virtual build-deps build-base git