r/frigate: Clean up Frigate role

* Switch to Quadlet-style `.container` for systemd unit
* Update to new image tag naming scheme (not arch-specific)
* Use environment variables for secrets
* Allow the entire `frigate_config` variable to be overridden

roles/frigate/defaults/main.yml

@@ -1,7 +1,16 @@
-frigate_image_tag: '{{ frigate_default_image_tag }}'
+frigate_image_tag: 0.12.1
+frigate_image: ghcr.io/blakeblackshear/frigate:{{ frigate_image_tag }}
 frigate_mqtt:
   host: localhost
 frigate_detectors:
   cpu:
     type: cpu
 frigate_cameras: {}
+frigate_enable_gpu: false
+frigate_enable_tpu: false
+frigate_shm_size: 256
+frigate_config:
+  mqtt: '{{ frigate_mqtt }}'
+  detectors: '{{ frigate_detectors }}'
+  cameras: '{{ frigate_cameras }}'
+frigate_env: {}