refactor dockerfile

Dockerfile

@@ -1,11 +1,22 @@
 FROM golang:1.18-alpine as builder
+
 RUN apk add --no-cache gcc musl-dev
-WORKDIR /build
-COPY . .
+
+WORKDIR /app
+
+COPY ["go.mod", "go.sum", "./"]
+RUN go mod download
+
+COPY *.go ./
+
 RUN go build -a -o bot
 
 FROM alpine:3.16
-COPY --from=builder /build/bot /app/bot
+
+COPY --from=builder /app/bot /app/bot
+
 WORKDIR /app
+
 RUN mkdir data
+
 ENTRYPOINT ["./bot"]