Convert booleans to lowercase

roles/docker/templates/docker-compose-env.j2

@@ -1,6 +1,10 @@
 # {{ ansible_managed }}
 {% if item.env is defined %}
-{% for kvpair in item.env.items() %}
-{{ kvpair.0 }}={{ kvpair.1 }}
+{% for key, value in item.env.items() %}
+{% if value is boolean %}
+{{ key }}={{ value | lower }}
+{% else %}
+{{ key }}={{ value }}
+{% endif %}
 {% endfor %}
 {% endif %}