Add a very simple nginx config validation script

Author: josbeir

test-nginx-config.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+
+# Script to test nginx.conf.sigil configuration locally using Docker
+# This reads the actual nginx.conf.sigil file, strips Dokku template variables, and validates it
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+NGINX_SIGIL="$SCRIPT_DIR/nginx.conf.sigil"
+TEST_CONFIG="/tmp/test-nginx.conf"
+
+if [ ! -f "$NGINX_SIGIL" ]; then
+    echo "❌ Error: nginx.conf.sigil not found at $NGINX_SIGIL"
+    exit 1
+fi
+
+echo "🔧 Reading nginx.conf.sigil and creating test config..."
+echo ""
+
+# Read nginx.conf.sigil and strip out Dokku template variables
+# Comment out include directives
+# Remove SSL from listen directives for testing (nginx requires certs to be present)
+# Replace SSL cert paths with dummy values
+sed -e 's|^.*include {{ \$.DOKKU_ROOT }}/{{ \$.APP }}/nginx.conf.d/\*\.conf;|  # include dummy;|g' \
+    -e 's| ssl http2;| http2;|g' \
+    -e 's|ssl_certificate.*{{ \$.APP_SSL_PATH }}/server.crt;|    # ssl_certificate /dummy/path.crt;|g' \
+    -e 's|ssl_certificate_key.*{{ \$.APP_SSL_PATH }}/server.key;|    # ssl_certificate_key /dummy/path.key;|g' \
+    "$NGINX_SIGIL" > "$TEST_CONFIG"
+
+echo "✅ Test config created at $TEST_CONFIG"
+echo ""
+echo "🐳 Testing nginx config with Docker..."
+echo ""
+
+# Test the config using nginx in Docker
+if docker run --rm -v "$TEST_CONFIG:/etc/nginx/conf.d/default.conf" nginx:alpine nginx -t 2>&1 | grep -q "syntax is ok"; then
+    echo ""
+    echo "✅ Nginx configuration is valid!"
+    echo ""
+    echo "📝 To manually inspect the test config: cat $TEST_CONFIG"
+    echo "🗑️  To remove the test config: rm $TEST_CONFIG"
+    exit 0
+else
+    echo ""
+    echo "❌ Nginx configuration has errors!"
+    echo ""
+    echo "📝 Check the test config: cat $TEST_CONFIG"
+    exit 1
+fi