This is a nice article and helped me in quick bringup of wordpress. I am newbie to wordpress installation & php. I have the following queries:
 I see that wp folder (www, wp-content) is copied on to both Caddy & PHP container. When I hit the wordpress:80 then which container is serving the wordpress?
 I have bought a raspberry pi 3 model B with 1 GB. After bringing up the three containers (including mysql), I see that few bytes (~30MB) is left as free. Is there anything I am missing?
Thanks once again for a wonderful writeup…