updated to multistage build, changed to alpine image

Dockerfile

@@ -1,17 +1,14 @@
 # syntax=docker/dockerfile:1
 
-FROM golang:latest
-
+FROM golang:latest AS bunny_build
 WORKDIR /app
-
 RUN git clone https://github.com/omgdanieltam/BunnyBot.git .
-
 RUN go mod download
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -o ./BunnyBot
 
-COPY auth.json ./
-
-RUN go build -o ./BunnyBot
-
+FROM alpine:latest
+WORKDIR /app
+COPY --from=bunny_build /app/BunnyBot /app/BunnyBot
 RUN chmod +x ./BunnyBot
-
+COPY auth.json ./
 CMD [ "./BunnyBot" ]