`./tools.mk check` fails in develop

[christoph-maurer]

When I follow the README of section Development until step 12 and enter ./tools.mk check , I receive

cloud@44ecf6f81f8f:~/machine$ ./tools.mk check         
ansible-lint \
	--config-file ./.ansible-lint \
	./setup.yaml

Passed: 0 failure(s), 0 warning(s) in 1 files processed of 1 encountered. Last profile that met the validation criteria was 'production'.
./ansible-playbook.sh \
	--syntax-check \
	./setup.yaml

playbook: ./setup.yaml
sudo vector validate \
	/etc/vector/vector.yaml
sudo: vector: command not found
make: *** [tools.mk:105: validate-vector] Error 1

With the target check-msmtp, I receive

cloud@a4c55e1755e2:~/machine$ ./tools.mk check-msmtp
msmtp --serverinfo
msmtp: cannot locate host mail.local.solarbuildingenvelopes.com: No address associated with hostname
make: *** [tools.mk:116: check-msmtp] Error 68

The target syntax-monit starts but never finishes:

cloud@a4c55e1755e2:~/machine$ ./tools.mk syntax-monit
sudo monit \
	-t \
	-c /etc/monit/monitrc