fix missing symlink for php cli command

Dockerfile

@@ -69,6 +69,7 @@ RUN apk --no-cache --repository=http://dl-cdn.alpinelinux.org/alpine/edge/testin
         && sed -ie "s#include /etc/nginx/http.d/#include /etc/nginx/conf.d/#g" /etc/nginx/nginx.conf \
         && postconf "smtputf8_enable = no" && postconf "maillog_file=/var/log/postfix/mail.log" \
         && mkdir /var/www/html && chown nginx:nginx /var/www/html \
+        && ln -sf /usr/bin/php82 /usr/bin/php \
         && ln -sf /dev/stdout /var/log/nginx/access.log \
         && ln -sf /dev/stderr /var/log/nginx/error.log