I managed to install mailman 3 suite (version 0.5) with Postorius. It turned out I had to set the name of the Postorius container to "mailman-web" in order to fix a gethostbyname('mailman-web') failure. Please add this to the documentation. It is probably linked to POSTORIUS_TEMPLATE_BASE_URL default setting, which references mailman-web
I managed to install mailman 3 suite (version 0.5) with Postorius. It turned out I had to set the name of the Postorius container to "mailman-web" in order to fix a gethostbyname('mailman-web') failure. Please add this to the documentation. It is probably linked to POSTORIUS_TEMPLATE_BASE_URL default setting, which references mailman-web