ENT-23: add hooks for running pre- and post-init scripts

docker/docker-entrypoint.sh

@@ -1,12 +1,19 @@
 #!/bin/bash
 # Runs on every start of the NetBox Docker container
 
-# Stop when an error occures
+# Stop when an error occurs
 set -e
 
 # Allows NetBox to be run as non-root users
 umask 002
 
+if [ -d /opt/init/pre ]; then
+  for FILE in /opt/init/pre/*.sh; do
+    echo "⚙️ Running pre-init script '${FILE}'..."
+    "${FILE}" "$@"
+  done
+fi
+
 # Load correct Python3 env
 # shellcheck disable=SC1091
 source /opt/netbox/venv/bin/activate
@@ -91,8 +98,15 @@ except Token.DoesNotExist:
     pass
 END
 
+if [ -d /opt/init/post ]; then
+  for FILE in /opt/init/post/*.sh; do
+    echo "⚙️ Running post-init script '${FILE}'..."
+    "${FILE}" "$@"
+  done
+fi
+
 echo "✅ Initialisation is done."
 
 # Launch whatever is passed by docker
-# (i.e. the RUN instruction in the Dockerfile)
+# (i.e. the CMD instruction in the Dockerfile)
 exec "$@"