Create extra layer for caching go dependencies

Fresher version of #129

Author: taraspos

Dockerfile

@@ -3,7 +3,11 @@ FROM golang:1.21-alpine AS builder
 RUN apk --no-cache add gcc musl-dev
 
 WORKDIR ${GOPATH}/src/github.com/mcuadros/ofelia
-COPY . ${GOPATH}/src/github.com/mcuadros/ofelia
+
+COPY go.mod go.sum ${GOPATH}/src/github.com/mcuadros/ofelia/
+RUN go mod download
+
+COPY . ${GOPATH}/src/github.com/mcuadros/ofelia/
 
 RUN go build -o /go/bin/ofelia .