feat: optional S3-compatible storage for uploaded images, instead of the local upload directory

cmd/server/main.go

@@ -52,6 +52,10 @@ var envDefaults = map[string]string{
 	"DB_MAX_IDLE_CONNS":              config.DefaultMaxIdleConns,
 	"DB_CONN_MAX_LIFETIME_SECONDS":   config.DefaultConnMaxLifetimeSeconds,
 	"UPLOAD_DIR":                     "./data/uploads",
+	config.EnvStorageDriver:          config.DefaultStorageDriver,
+	"S3_REGION":                      config.DefaultS3Region,
+	"S3_PATH_STYLE":                  config.DefaultS3PathStyle,
+	"S3_TLS":                         config.DefaultS3TLS,
 	"AUTH_RATE_LIMIT_MAX_ATTEMPTS":   "5",
 	"AUTH_RATE_LIMIT_WINDOW_SECONDS": "60",
 	"TRUSTED_PROXIES":                "",
@@ -115,7 +119,11 @@ func applyEnvDefaults() {
 }
 
 func ensureRequiredEnvVars() {
-	required := slices.Concat(requiredEnvVars, config.DatabaseRequiredEnvVars(os.Getenv(config.EnvDatabaseDriver)))
+	required := slices.Concat(
+		requiredEnvVars,
+		config.DatabaseRequiredEnvVars(os.Getenv(config.EnvDatabaseDriver)),
+		config.StorageRequiredEnvVars(os.Getenv(config.EnvStorageDriver)),
+	)
 	if err := config.MissingEnvVarError(required, os.LookupEnv); err != nil {
 		panic(err.Error())
 	}