update(vitest cookbook): add "Run a subset of tests"

Author: ArturT

docusaurus/docs/vitest/cookbook.md

@@ -0,0 +1,15 @@
+---
+pagination_next: null
+pagination_prev: null
+---
+
+# Vitest Cookbook
+
+## Run a subset of tests
+
+To run a subset of your test suite you have a couple of options:
+
+- `KNAPSACK_PRO_TEST_FILE_*` environment variables:
+  - [`KNAPSACK_PRO_TEST_FILE_PATTERN`](reference.md#knapsack_pro_test_file_pattern)
+  - [`KNAPSACK_PRO_TEST_FILE_EXCLUDE_PATTERN`](reference.md#knapsack_pro_test_file_exclude_pattern)
+  - [`KNAPSACK_PRO_TEST_FILE_LIST_SOURCE_FILE`](reference.md#knapsack_pro_test_file_list_source_file)

docusaurus/sidebars.ts

@@ -244,6 +244,11 @@ const sidebars: SidebarsConfig = {
           label: "Troubleshooting",
           id: "vitest/troubleshooting",
         },
+        {
+          type: "doc",
+          label: "Cookbook",
+          id: "vitest/cookbook",
+        },
         {
           type: "link",
           label: "GitHub",