bump golang v. to 1.18

for fixing dependency issues

Author: vedant-kakde

cmd/server/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.14-alpine AS build
+FROM golang:1.18-alpine AS build
 
 RUN mkdir -p /go/src/github.com/zacscoding/gin-rest-api-example ~/.ssh && \
     apk add --no-cache git openssh-client make gcc libc-dev
@@ -8,4 +8,4 @@ RUN make build
 
 FROM alpine:3
 COPY --from=build /go/src/github.com/zacscoding/gin-rest-api-example/article-server /bin/article-server
-CMD /bin/article-server
+CMD /bin/article-server