update Dockerfile

Dockerfile

@@ -1,14 +1,31 @@
-FROM golang:alpine
-RUN apk add git
+FROM golang:alpine as builder
 
-ENV MODE=production
-ENV GIN_MODE=release
+# Set the Current Working Directory inside the container
+WORKDIR /app
 
-WORKDIR /go/src/app
+# Copy go mod and sum files
+COPY go.mod go.sum ./
+
+# Download all dependencies. Dependencies will be cached if the go.mod and go.sum files are not changed
+RUN go mod download
+
+# Copy the source from the current directory to the Working Directory inside the container
 COPY . .
 
 RUN go build -o main .
 
+######## Start a new stage from scratch #######
+FROM alpine:latest  
+
+RUN apk --no-cache add ca-certificates
+
+WORKDIR /root/
+
+# Copy the Pre-built binary file from the previous stage
+COPY --from=builder /app/main .
+
+ENV MODE=production
+ENV GIN_MODE=release
 EXPOSE 8080
 
 ADD https://github.com/ufoscout/docker-compose-wait/releases/download/2.2.1/wait ./wait