feat: add docker file for static server example

example/server/main.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"os"
 
 	"github.com/zitadel/oidc/v2/example/server/exampleop"
 	"github.com/zitadel/oidc/v2/example/server/storage"
@@ -12,8 +13,12 @@ import (
 func main() {
 	//we will run on :9998
 	port := "9998"
-	//which gives us the issuer: http://localhost:9998/
-	issuer := fmt.Sprintf("http://localhost:%s/", port)
+
+	issuer, ok := os.LookupEnv("ISSUER")
+	if !ok {
+		//which gives us the issuer: http://localhost:9998/
+		issuer = fmt.Sprintf("http://localhost:%s/", port)
+	}
 
 	// the OpenIDProvider interface needs a Storage interface handling various checks and state manipulations
 	// this might be the layer for accessing your database
@@ -26,7 +31,7 @@ func main() {
 		Addr:    ":" + port,
 		Handler: router,
 	}
-	log.Printf("server listening on http://localhost:%s/", port)
+	log.Printf("server listening on %s", issuer)
 	log.Println("press ctrl+c to stop")
 	err := server.ListenAndServe()
 	if err != nil {