Dockerfile, settable port

* added Dockerfile
* server listenting port is configurable via CLI argument

Dockerfile

@@ -0,0 +1,19 @@
+FROM alpine:3.15.0
+
+RUN apk add --no-cache git go && \
+    mkdir /oko-server && \
+    cd /oko-server && \
+    git clone https://github.com/Cernobor/oko-server.git /oko-server/git && \
+    cd /oko-server/git && \
+    go build && \
+    cp /oko-server/git/oko-server /oko-server/ && \
+    cd /oko-server && \
+    rm -rf /oko-server/git && \
+    mkdir /data && \
+    apk del git go && \
+    rm -rf /root/go && \
+    echo -e '#!/bin/sh\n/oko-server/oko-server "$@"' > /oko-server/entrypoint.sh && \
+    chmod +x /oko-server/entrypoint.sh
+VOLUME ["/data"]
+
+ENTRYPOINT ["/oko-server/entrypoint.sh"]

main.go

@@ -14,8 +14,9 @@ import (
 )
 
 func main() {
-	dbFileArg := flag.String("dbfile", "./data.sqlite3", "File that holds the server's sqlite3 database. Will be created if it does not exist. Default is \"./data.sqlite3\".")
 	tilepackFileArg := flag.String("tilepack", "", "File that will be sent to clients when they request a tile pack, also used to serve tiles in online mode. Required.")
+	portArg := flag.Int("port", 8080, "Port where the server will listen to. Default is 8080.")
+	dbFileArg := flag.String("dbfile", "./data.sqlite3", "File that holds the server's sqlite3 database. Will be created if it does not exist. Default is \"./data.sqlite3\".")
 	apkFileArg := flag.String("apk", "", "APK file with the client app. If not specified, no APK will be available (404).")
 	reinitDBArg := flag.Bool("reinit-db", false, "Reinitializes the DB, which means all the tables will be recreated, deleting all data.")
 	minZoomArg := flag.Int("min-zoom", 1, "Minimum zoom that will be sent to clients.")
@@ -31,6 +32,7 @@ func main() {
 	}
 
 	s := server.New(server.ServerConfig{
+		Port:         *portArg,
 		DbPath:       *dbFileArg,
 		TilepackPath: *tilepackFileArg,
 		ApkPath:      *apkFileArg,

server/server.go

@@ -34,6 +34,7 @@ type Server struct {
 }
 
 type ServerConfig struct {
+	Port          int
 	DbPath        string
 	TilepackPath  string
 	ApkPath       string
@@ -59,7 +60,7 @@ func (s *Server) Run(ctx context.Context) {
 	router := s.setupRouter()
 
 	server := &http.Server{
-		Addr:    fmt.Sprintf(":%d", 8080),
+		Addr:    fmt.Sprintf(":%d", s.config.Port),
 		Handler: router,
 	}
 	s.log.Infof("Running on %s", server.Addr)