chore(dockerfile): use ARG and ENV vars to improve image configuration

Author: Genesis Alvarez

Dockerfile

@@ -1,6 +1,6 @@
-ARG IMAGE_LOCATION=iterativodo/dockerdoo
+ARG IMAGE_LOCATION=us-docker.pkg.dev/odoo-do/odoo/dockerdoo
 ARG ODOO_VERSION=15.0
-FROM us-docker.pkg.dev/odoo-do/odoo/dockerdoo:15
+FROM ${IMAGE_LOCATION}:${ODOO_VERSION}
 
 ARG ODOO_VERSION
 ENV ODOO_EXTRA_ADDONS /mnt/extra-addons