Switch to Buster and php 7.3

Dockerfile

-FROM registry.git.autistici.org/ai3/docker/apache2-base:master
+FROM registry.git.autistici.org/ai3/docker/apache2-base:buster
 
 COPY conf /tmp/conf
 COPY build.sh /tmp/build.sh

build.sh

@@ -43,7 +43,8 @@ chmod 0755 /usr/sbin/php-fpm-exporter
 echo "export PHP_FPM_EXPORTER_PORT=\`expr \$APACHE_PORT + 200\`" >> /etc/apache2/envvars
 
 # Enable php configuration.
-a2enconf -q php7.0-fpm php7.0-fpm-proxy-fcgi
+a2enmod proxy_fcgi setenvif
+a2enconf -q php7.3-fpm
 
 # Rsync our configuration, on top of /etc.
 rsync -a /tmp/conf/ /etc/

conf/chaperone.d/fpm.conf

 fpm.service: {
-    command: "/usr/sbin/php-fpm7.0 --force-stderr --nodaemonize",
+    command: "/usr/sbin/php-fpm7.3 --force-stderr --nodaemonize",
     exit_kills: true,
 }
 fpm-exporter.service: {
-    command: "sh -c '. /etc/apache2/envvars && HOME=/ exec /usr/sbin/php-fpm-exporter server --phpfpm.scrape-uri=unix:///run/php/php7.0-fpm.sock\\;/status --web.listen-address=:$PHP_FPM_EXPORTER_PORT'",
+    command: "sh -c '. /etc/apache2/envvars && HOME=/ exec /usr/sbin/php-fpm-exporter server --phpfpm.scrape-uri=unix:///run/php/php7.3-fpm.sock\\;/status --web.listen-address=:$PHP_FPM_EXPORTER_PORT'",
     restart: true,
 }

conf/php/7.0/fpm/php-fpm.conf

-[global]
-pid = /run/php/php7.0-fpm.pid
-error_log = /var/log/php7.0-fpm.log
-systemd_interval = 0
-
-include=/etc/php/7.0/fpm/pool.d/*.conf

conf/php/7.3/fpm/php-fpm.conf

+[global]
+pid = /run/php/php7.3-fpm.pid
+error_log = /var/log/php7.3-fpm.log
+systemd_interval = 0
+
+include=/etc/php/7.3/fpm/pool.d/*.conf

conf/php/7.0/fpm/pool.d/www.conf → conf/php/7.3/fpm/pool.d/www.conf

 [www]
-listen = /run/php/php7.0-fpm.sock
+listen = /run/php/php7.3-fpm.sock
 
 pm = dynamic
 pm.max_children = 20
@@ -25,5 +25,3 @@ php_admin_value[opcache.memory_consumption] = 64
 php_admin_value[opcache.interned_strings_buffer] = 16
 php_admin_value[opcache.max_accelerated_files] = 4000
 php_admin_value[opcache.validate_timestamps] = 0
-php_admin_value[opcache.fast_shutdown] = 1
-