fix: e2e caddy test after changing the config header

test/e2e/service_test.go

@@ -480,7 +480,11 @@ myapp.example.com {
 		// Check that the Caddy config hasn't changed.
 		newConfig, err := cli.Caddy.GetConfig(ctx, nil)
 		require.NoError(t, err)
-		assert.Equal(t, validConfig, newConfig.Caddyfile,
+
+		// Compare stable parts of the Caddyfile only (skip autogenerated comment with timestamp).
+		_, stableValidConfig, _ := strings.Cut(validConfig, "\n")
+		_, stableNewConfig, _ := strings.Cut(newConfig.Caddyfile, "\n")
+		assert.Equal(t, stableValidConfig, stableNewConfig,
 			"Caddy config should not change when an invalid user-defined Caddy config is deployed")
 	})