home-assistant: Deploy mqtt2vl

`mqtt2vl` is a relatively simple service I developed to read log
messages from an MQTT topic (i.e. those published by ESPHome devices)
and stream them to Victoria Logs over HTTPS.

home-assistant/mqtt2vl.toml

@@ -0,0 +1,11 @@
+[mqtt]
+url = "mqtts://mqtt.pyrocufflink.blue"
+username = "mqtt2vl"
+password_file = "/run/secrets/du51tn.xyz/mqtt2vl/mqtt.password"
+topics = [
+    "poolsensor/debug",
+    "garden1/debug",
+]
+
+[http]
+url = "https://logs.pyrocufflink.blue/insert/jsonline?_stream_fields=topic"