update: add dockerfile

Dockerfile

@@ -0,0 +1,20 @@
+FROM golang:1.23.1-alpine3.20 AS go_builder
+
+WORKDIR /src
+COPY . .
+
+RUN apk update && apk upgrade && apk add --no-cache ca-certificates tzdata
+RUN update-ca-certificates
+RUN go build -o ./tmp/main
+
+FROM scratch
+
+WORKDIR /src
+
+COPY --from=go_builder /usr/share/zoneinfo /usr/share/zoneinfo
+COPY --from=go_builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=go_builder /src/tmp/main /src
+
+ENV TZ Asia/Jakarta
+
+ENTRYPOINT ["./main"]

main.go

@@ -5,6 +5,7 @@ import (
 	"log"
 	"os"
 	"tunnel_pls/server"
+	"tunnel_pls/utils"
 )
 
 func main() {
@@ -19,9 +20,9 @@ func main() {
 	log.SetOutput(os.Stdout)
 	log.SetFlags(log.LstdFlags | log.Lshortfile)
 
-	privateBytes, err := os.ReadFile("id_rsa")
+	privateBytes, err := os.ReadFile(utils.Getenv("ssh_private_key"))
 	if err != nil {
-		log.Fatal("Failed to load private key (./id_rsa)")
+		log.Fatalf("Failed to load private key : %s", err.Error())
 	}
 
 	private, err := ssh.ParsePrivateKey(privateBytes)

server/https.go

@@ -10,10 +10,11 @@ import (
 	"strings"
 	"time"
 	"tunnel_pls/session"
+	"tunnel_pls/utils"
 )
 
 func NewHTTPSServer() error {
-	cert, err := tls.LoadX509KeyPair("certs/localhost.direct.SS.crt", "certs/localhost.direct.SS.key")
+	cert, err := tls.LoadX509KeyPair(utils.Getenv("cert_loc"), utils.Getenv("key_loc"))
 	if err != nil {
 		return err
 	}

server/server.go

@@ -25,11 +25,9 @@ func NewServer(config ssh.ServerConfig) *Server {
 		go func() {
 			err := NewHTTPSServer()
 			if err != nil {
-				if err != nil {
+				log.Fatalf("failed to start https server: %v", err)
-					log.Fatalf("failed to start https server: %v", err)
-				}
-				return
 			}
+			return
 		}()
 	}
 	go func() {