我的 Go Module 項目遇到的錯誤/bin/sh: 微服務: 未找到文件FROM golang:1.7.4-alpineMAINTAINER John DoeENV SOURCES /go/src/github.com/john/app/COPY . ${SOURCES}RUN cd ${SOURCES} && cgo_enabled=0 go installENV PORT 8080EXPOSE 8080ENTRYPOINT microservice微服務.gopackage mainimport (    "fmt"    "net/http"    "os")func main() {    http.HandleFunc("/", index)    http.ListenAndServe(port(), nil)}func port() string {    port := os.Getenv("PORT")    fmt.Println(port)    if len(port) == 0 {        port = "8080"    }    return ":" + port}func index(w http.ResponseWriter, r *http.Request) {    w.WriteHeader(http.StatusOK)    fmt.Fprintf(w, "Hello World.")}這是一個 Go 模塊項目。我使用以下命令創建了一個圖像。docker build -t app:1.0.3 .并通過運行它docker run -it -p 8080:8080 app:1.0.3