更新 Dockerfile

@@ -4,7 +4,6 @@ ENV APP_DIR $GOPATH/src/project
 RUN mkdir -p $APP_DIR
 WORKDIR $APP_DIR/
 COPY ./pkg pkg
-COPY ./conf conf
 COPY ./go.mod go.mod
 COPY ./go.sum go.sum
 COPY ./main.go main.go