docs: how to debug integration tests (#1067)

* docs: how to debug integration tests

Signed-off-by: zhengkezhou1 <[email protected]>

* move to dev guide

Signed-off-by: zhengkezhou1 <[email protected]>

* Update site-src/contributing/devguide.md

Co-authored-by: Nir Rozenbaum <[email protected]>

* run test in shell

Signed-off-by: zhengkezhou1 <[email protected]>

---------

Signed-off-by: zhengkezhou1 <[email protected]>
Co-authored-by: Nir Rozenbaum <[email protected]>

Author: zhengkezhou1

site-src/contributing/devguide.md

@@ -0,0 +1,51 @@
+# Developer Guide
+
+## Integration Tests Debug Guide
+This document provides detailed instructions on how to run and debug integration tests locally in debug mode.
+
+### Prerequisites
+
+#### 1. Install Required Tools
+Ensure the envtest tool is installed:
+```bash
+$ make envtest
+```
+
+#### 2. Verify Kubernetes Test Environment
+Run the following command to set up and verify the test environment:
+```bash
+$ ./bin/setup-envtest use 1.31.0 --bin-dir ./bin -p path
+bin/k8s/1.31.0-darwin-arm64
+```
+### Run test in shell
+```shell
+export KUBEBUILDER_ASSETS=<project-root-path>/bin/k8s/1.31.0-<platform-architecture> 
+go test sigs.k8s.io/gateway-api-inference-extension/test/integration/epp -run <test-function-name>
+```
+
+### Configure and Run in GoLand
+
+#### 1. Create Test Configuration
+Select the test case you want to debug:
+![](../images/modify-run-configuration.png)
+
+#### 2. Configure Environment Variables
+Set environment variables in the Run/Debug Configuration:
+
+![](../images/edit-environment-variables.png)
+
+**Required environment variable:**
+
+- **Name:** `KUBEBUILDER_ASSETS`
+- **Value:** `<project-root-path>/bin/k8s/1.31.0-<platform-architecture>`
+
+**Example path:**
+```
+/go/src/kubernetes.io/gateway-api-inference-extension/bin/k8s/1.31.0-darwin-arm64
+```
+
+#### 3. Set Breakpoints and Run
+
+Example Output:
+
+![](../images/running-example.png)