fix: Added a simple check

entrypoint.sh

@@ -1,4 +1,6 @@
 #!/bin/sh
+if [ $DOMAIN -a $EMAIL]; then
+    if [ ! -e /usr/local/apache2/.configured ]; then
         cat >> /usr/local/apache2/conf/httpd.conf <<EOF
 ServerName $DOMAIN
 ServerAdmin $EMAIL
@@ -9,4 +11,7 @@ EOF
         httpd -k start
         certbot --apache -n --keep -d $DOMAIN -m $EMAIL
         httpd -k stop
+        touch /usr/local/apache2/.configured
+    fi
+fi
 httpd-foreground