feat: add E2E tests with mock Nginx services, update Traefik routing to use service names, and integrate testing into the CI workflow.

tests/regression.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+set -e
+
+# Configuration
+DOMAIN=${DOMAIN:-dev.kovagoadi.hu}
+# Configuration
+DOMAIN=${DOMAIN:-dev.kovagoadi.hu}
+PORT=${PORT:-898}
+# We target localhost directly to test the local instance, bypassing public DNS
+TARGET_URL="http://127.0.0.1:${PORT}"
+HOST_HEADER="test-whoami.${DOMAIN}"
+
+echo "Running regression tests against ${TARGET_URL} with Host: ${HOST_HEADER}..."
+
+# Test 1: Check if whoami service is reachable and returns 200 OK
+echo "Test 1: Checking connectivity to whoami service..."
+HTTP_CODE=$(curl -s -o /dev/null -w "%{http_code}" -H "Host: ${HOST_HEADER}" "${TARGET_URL}")
+
+if [ "$HTTP_CODE" -eq 200 ]; then
+    echo "  [PASS] Service returned 200 OK"
+else
+    echo "  [FAIL] Service returned $HTTP_CODE (Expected 200)"
+    exit 1
+fi
+
+# Test 2: Check for specific content (whoami usually returns "Hostname: ...")
+echo "Test 2: Checking content..."
+CONTENT=$(curl -s -H "Host: ${HOST_HEADER}" "${TARGET_URL}")
+if echo "$CONTENT" | grep -q "Hostname:"; then
+    echo "  [PASS] Content contains 'Hostname:'"
+else
+    echo "  [FAIL] Content does not look like whoami output"
+    echo "  Output: $CONTENT"
+    exit 1
+fi
+
+echo "All regression tests passed!"