add docker compose and netbox default configuration

• Add docker-compose
• Add default env files

tests/env/netbox.env

+CORS_ORIGIN_ALLOW_ALL=True
+DB_HOST=postgres
+DB_NAME=netbox
+DB_PASSWORD=J5brHrAXFLQSif0K
+DB_USER=netbox
+EMAIL_FROM=netbox@bar.com
+EMAIL_PASSWORD=
+EMAIL_PORT=25
+EMAIL_SERVER=localhost
+EMAIL_SSL_CERTFILE=
+EMAIL_SSL_KEYFILE=
+EMAIL_TIMEOUT=5
+EMAIL_USERNAME=netbox
+# EMAIL_USE_SSL and EMAIL_USE_TLS are mutually exclusive, i.e. they can't both be `true`!
+EMAIL_USE_SSL=false
+EMAIL_USE_TLS=false
+GRAPHQL_ENABLED=true
+HOUSEKEEPING_INTERVAL=86400
+MEDIA_ROOT=/opt/netbox/netbox/media
+METRICS_ENABLED=false
+REDIS_CACHE_DATABASE=1
+REDIS_CACHE_HOST=redis-cache
+REDIS_CACHE_INSECURE_SKIP_TLS_VERIFY=false
+REDIS_CACHE_PASSWORD=t4Ph722qJ5QHeQ1qfu36
+REDIS_CACHE_SSL=false
+REDIS_DATABASE=0
+REDIS_HOST=redis
+REDIS_INSECURE_SKIP_TLS_VERIFY=false
+REDIS_PASSWORD=H733Kdjndks81
+REDIS_SSL=false
+RELEASE_CHECK_URL=https://api.github.com/repos/netbox-community/netbox/releases
+SECRET_KEY=r(m)9nLGnz$(_q3N4z1k(EFsMCjjjzx08x9VhNVcfd%6RF#r!6DE@+V5Zk2X
+SKIP_SUPERUSER=true
+WEBHOOKS_ENABLED=true