Add initial tls support

- Uses certificate and key files provided by admin in config
- Let's Encrypt integration planned, but not even close to working
- Initial HTTP3 Support added

config/config.go

@@ -14,8 +14,10 @@ type ConfigSSL struct {
 	HandleSSL bool `toml:"handle_ssl"` // Whether Linstrom should handle SSL encryption itself in case of http1/2
 	// If Linstrom is to handle SSL, whether it should use LetsEncrypt for certificates
 	UseLetsEncrypt *bool `toml:"use_lets_encrypt"`
-	// Path to the certificate if Linstrom is to handle SSL while not using LetsEncrypt
+	// Path to the certificate file (.crt) if Linstrom is to handle SSL while not using LetsEncrypt
 	CertificateFile *string `toml:"certificate_file"`
+	// Path to the certificate key file (.key) to handle SSL while not using LetsEncrypt
+	CertKeyFile *string `toml:"cert_key_file"`
 	// Mail adress to use in case of using LetsEncrypt
 	AdminMail *string `toml:"admin_mail"`
 }
@@ -251,6 +253,14 @@ func (gc *ConfigGeneral) GetFullPublicUrl() string {
 	return str
 }
 
+func (gc *ConfigGeneral) GetFinalPublicPort() int {
+	if gc.PublicPort != nil {
+		return *gc.PublicPort
+	} else {
+		return gc.PrivatePort
+	}
+}
+
 func (sc *ConfigStorage) BuildPostgresDSN() string {
 	dsn := fmt.Sprintf(
 		"host=%s user=%s password=%s dbname=%s port=%d",