Let "latest" tag follow the highest version

Latest tag is now added to the new version when it is release by Netbox.

build-functions/docker-functions.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+push_image_to_registry() {
+  local target_tag=$1
+  echo "⏫ Pushing '${target_tag}'"
+  $DRY docker push "${target_tag}"
+  echo "✅ Finished pushing the Docker image '${target_tag}'."
+}