Added fallback version '0.0'

Installing depends on the VERSION file, so it raies an error if it is
installed in some other way.

ReadTheDocs installs the package so it can generate code docs.
This commit adds a default version 0.0

Makefile

@@ -85,8 +85,6 @@ git_push:
 pip_upload:
 	python setup.py sdist upload ;
 
-pip_test: $(addprefix pip_test-,$(PYVERSIONS))
-
 run-%: build-%
 	docker run --rm -p 5000:5000 -ti '$(IMAGEWTAG)-python$(PYMAIN)' --default-plugins
 
@@ -101,6 +99,10 @@ push-latest: build-$(PYMAIN)
 push-%: build-%
 	docker push $(IMAGENAME):$(VERSION)-python$*
 
+push: $(addprefix push-,$(PYVERSIONS))
+	docker tag '$(IMAGEWTAG)-python$(PYMAIN)' '$(IMAGEWTAG)'
+	docker push  $(IMAGENAME):$(VERSION)
+
 ci:
 	gitlab-runner exec docker --docker-volumes /var/run/docker.sock:/var/run/docker.sock --env CI_PROJECT_NAME=$(NAME) ${action}