Use a multistage build for the docker transcoder

transcoder/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.21-alpine
+FROM golang:1.21-alpine as build
 RUN apk add --no-cache build-base ffmpeg libmediainfo-dev
 WORKDIR /app
 COPY go.mod go.sum ./
@@ -6,5 +6,10 @@ RUN go mod download
 COPY . .
 RUN go build -o ./transcoder
 
+FROM alpine
+RUN apk add --no-cache build-base ffmpeg libmediainfo-dev
+WORKDIR /app
+COPY --from=build /app/transcoder /app/transcoder
+
 EXPOSE 7666
 CMD ./transcoder