This seems to work, Ubuntu is hoarding port 53 though even though local services are shut off.

Config/DNS/run.sh

@@ -0,0 +1,47 @@
+# 2023-07-29
+# Config/DNS/run.sh
+# Fix common issues when trying to run this container.
+
+function stop-service {
+	service=""
+	if [[ -n $1 ]]; then
+		service=$1
+	else
+		echo "ERROR: A parameter was not provided for stop-service, aborting."
+		exit 1
+	fi
+	if [[ -n $2 ]]; then
+		echo "ERROR: A second parameter to stop-service is not expected, aborting."
+		exit 1
+	fi
+	systemctl disable --now $service &&
+		echo "$service stopped successfully!" ||
+		echo "$service was not found, no problem."
+}
+
+echo -e "\n*** Turn off any local DNS programs ***"
+# These programs use port 53 but this container needs to be able to listen on it.
+stop-service systemd-resolved
+stop-service dnsmasq
+
+echo -e "\n*** Create a working DNS file ***"
+# Allows the domains needed during the docker pull/build to be accessed.
+if [[ ! -e /etc/resolv.conf.save ]]; then
+	# Save the existing file if a backup does not already exist.
+	mv /etc/resolv.conf /etc/resolv.conf.save
+fi
+echo "nameserver 1.1.1.1" > /etc/resolv.conf
+
+echo -e "\n*** Start the docker container ***"
+docker compose down
+docker compose build
+docker compose up -d
+
+echo -e "\n*** Now use the local process for DNS ***\n/etc/resolv.conf:"
+echo "nameserver 127.0.0.1" > /etc/resolv.conf
+echo "nameserver 127.0.1.1" >> /etc/resolv.conf
+cat /etc/resolv.conf
+
+# Finish
+echo " "
+exit 0