improve local dev + contribution guide

docker/dev-ssu/Dockerfile

@@ -2,7 +2,7 @@ FROM serversideup/php:8.2-fpm-nginx
 
 ARG TARGETPLATFORM
 # https://github.com/cloudflare/cloudflared/releases
-ARG CLOUDFLARED_VERSION=2023.8.2
+ARG CLOUDFLARED_VERSION=2023.10.0
 
 ARG POSTGRES_VERSION=15
 RUN apt-get update

docker/dev-ssu/etc/s6-overlay/s6-rc.d/init-setup/type

@@ -0,0 +1 @@
+oneshot

docker/dev-ssu/etc/s6-overlay/s6-rc.d/init-setup/up

@@ -0,0 +1,4 @@
+#!/command/execlineb -P
+foreground { composer -d /var/www/html/ install }
+foreground { php /var/www/html/artisan key:generate }
+foreground { php /var/www/html/artisan migrate --step }