my file learn about tech container (docker, podman, kubernetes)
EXPOSE port #default tcp
EXPOSE port/tcp
EXPOSE port/udp
FROM golang:1.18-alpine
RUN mkdir app
COPY main.go app
EXPOSE 8080
CMD go run app/main.go
package main
import (
    "fmt"
    "net/http"
)
func main() {
    http.HandleFunc("/", HelloServer)
    http.ListenAndServe(":8080", nil)
}
func HelloServer(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hello, World!")
}