vimagick / dockerfiles

Please remove the trailing slash in /etc/dnsmasq.d/

Line 11 in 9500190

&& echo "conf-dir=/etc/dnsmasq.d/,*.conf" >> /etc/dnsmasq.conf

is visible at least in log output
dnsmasq: unsupported option (check that dnsmasq was compiled with DHCP/TFTP/DNSSEC/DBus support) at line 2 of /etc/dnsmasq.d//dnssec.conf

The example in dnsmasq man is dir=/path/to/dir,*.conf

dnsmasq: conf-dir option without trailing slash