Add optional peripheral API configuration options

Added optional configuration settings for peripheral API in .env.example.

.env.example

@@ -67,6 +67,21 @@ LVA_PULSE_COOKIE="/run/user/${LVA_USER_ID}/pulse/cookie"
 # Start listening immediately after wake word detection, without waiting for the wake sound to finish
 # LISTEN_DURING_WAKE_SOUND="1"
 
+### Perpheral api host (optional):
+# Bind address for the peripheral WebSocket API
+# PERIPHERAL_HOST="0.0.0.0"
+
+### Perpheral api port (optional):
+# Port for the peripheral WebSocket API
+# PERIPHERAL_PORT="6055"
+
+### Peripheral api volume step (optional):
+# Volume change for peripheral api per button press, 0.0–1.0
+# PERIPHERAL_VOLUME_STEP="%(default)s"
+
+### Disable the peripheral WebSocket API entirely
+# DISABLE_PERIPHERAL_API="1"
+
 ### Wake word directory (optional):
 # path for custom files in docker is for example "app/wakewords/custom"
 # WAKE_WORD_DIR="app/wakewords"