Initial commit: add .gitignore and README

test-docker-dns.sh

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+#!/bin/bash
+# Test Docker DNS connectivity
+echo "Testing Docker DNS connectivity..."
+echo ""
+
+# Test 1: Try to resolve registry
+echo "Test 1: DNS resolution from Docker container"
+docker run --rm --dns 8.8.8.8 alpine nslookup registry-1.docker.io 2>&1 | head -5 || echo "Failed"
+
+# Test 2: Try to pull with explicit DNS
+echo ""
+echo "Test 2: Pulling image with explicit DNS"
+docker run --rm --dns 8.8.8.8 --dns 8.8.4.4 alpine echo "DNS test container started" 2>&1 || echo "Failed"
+
+echo ""
+echo "If both tests fail, Docker Desktop DNS needs to be configured."