ci: force IPv4 DNS in dind

Jenkinsfile

@@ -21,9 +21,20 @@ spec:
     env:
     - name: DOCKER_TLS_CERTDIR
       value: ""
+    command:
+    - /bin/sh
+    - -c
     args:
-    - --mtu=1400
-    - --dns=10.43.0.10
+    - |
+        set -euo pipefail
+        apk add --no-cache dnsmasq
+        cat > /etc/dnsmasq.conf <<'EOF'
+        filter-aaaa
+        server=10.43.0.10
+        EOF
+        dnsmasq
+        echo "nameserver 127.0.0.1" > /etc/resolv.conf
+        exec dockerd-entrypoint.sh --mtu=1400
     volumeMounts:
     - name: dind-storage
       mountPath: /var/lib/docker