Create cache/.htaccess at startup

In case it's a tmpfs.

docker/conf/cont-init.d/50cache-htaccess

+#!/bin/sh
+
+cache_dir=/opt/noblogs/www/wp-content/cache
+
+if [ ! -e "$cache_dir/.htaccess" ]; then
+    mkdir -p $cache_dir
+    cat >"$cache_dir/.htaccess" <<EOF
+Options -Indexes
+Header set Vary "Accept-Encoding, Cookie"
+Header set Cache-Control "max-age=300"
+ExpiresActive On
+ExpiresByType text/html A300
+EOF
+fi
+
+exit 0