Update README.md

Add status badge for the 'push' workflow

README.md

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 This is OxCERT's fork of the [netbox-docker](https://github.com/netbox-community/netbox-docker/wiki) repository.
 
+[![push](https://github.com/oxcert/netbox-docker/actions/workflows/push.yml/badge.svg)](https://github.com/oxcert/netbox-docker/actions/workflows/push.yml) 
+
 We have a local branch [oxcert](https://github.com/oxcert/netbox-docker/tree/oxcert) which has been set as the default branch in this repository.
 The idea is to keep the [release](https://github.com/oxcert/netbox-docker/tree/release) branch in synch with upstream but keep all our changes in
 the oxcert branch, from where we build our netbox containers, etc. When there are upstream changes, we merge them in from the release branch.