Use ghcr for source image

Author: jacobw

Dockerfile

@@ -1,6 +1,4 @@
-FROM netboxcommunity/netbox:latest
-LABEL org.opencontainers.image.source=https://github.com/jacobw/netbox-docker-plugins
-
+FROM ghcr.io/netbox-community/netbox:latest
 
 COPY ./plugin_requirements.txt /opt/netbox/
 RUN /opt/netbox/venv/bin/pip install  --no-warn-script-location -r /opt/netbox/plugin_requirements.txt