adjust dockerfile

Dockerfile

@@ -1,6 +1,8 @@
 FROM golang:latest
 
+WORKDIR /root
+
 # pre-copy/cache go.mod for pre-downloading dependencies and only redownloading them in subsequent builds if they change
 COPY . .
 RUN go mod tidy && go build -v -o app
-ENTRYPOINT app
+ENTRYPOINT /root/app