chore(db): get InfluxDB token by secrets

Assisted-by: Gemini:gemini-3-flash
Signed-off-by: Klagarge <remi@heredero.ch>

db/src/main.go

@@ -66,8 +66,19 @@ func influxConnection() *influx.InfluxGateway {
 		influxDatabase = "provence"
 	}
 
-	influxToken, ok := os.LookupEnv("INFLUX_TOKEN")
-	if !ok {
+	influxToken := os.Getenv("INFLUX_TOKEN")
+	if influxToken == "" {
+		if tokenFile := os.Getenv("INFLUX_TOKEN_FILE"); tokenFile != "" {
+			content, err := os.ReadFile(tokenFile)
+			if err == nil {
+				influxToken = strings.TrimSpace(string(content))
+			} else {
+				log.Printf("[Main] Warning: could not read token file %s: %v\n", tokenFile, err)
+			}
+		}
+	}
+
+	if influxToken == "" {
 		influxToken = "password"
 	}