Add @github/local-action and documentation

.env.example

@@ -0,0 +1,59 @@
+# Do not commit your actual .env file to Git! This may contain secrets or other
+# private information.
+
+# Enable/disable step debug logging (default: `false`). For local debugging, it
+# may be useful to set it to `true`.
+ACTIONS_STEP_DEBUG=true
+
+# GitHub Actions inputs should follow `INPUT_<name>` format (case-sensitive).
+# Hyphens should not be converted to underscores!
+INPUT_MILLISECONDS=2400
+
+# GitHub Actions default environment variables. These are set for every run of a
+# workflow and can be used in your actions. Setting the value here will override
+# any value set by the local-action tool.
+# https://docs.github.com/en/actions/learn-github-actions/variables#default-environment-variables
+
+# CI="true"
+# GITHUB_ACTION=""
+# GITHUB_ACTION_PATH=""
+# GITHUB_ACTION_REPOSITORY=""
+# GITHUB_ACTIONS=""
+# GITHUB_ACTOR=""
+# GITHUB_ACTOR_ID=""
+# GITHUB_API_URL=""
+# GITHUB_BASE_REF=""
+# GITHUB_ENV=""
+# GITHUB_EVENT_NAME=""
+# GITHUB_EVENT_PATH=""
+# GITHUB_GRAPHQL_URL=""
+# GITHUB_HEAD_REF=""
+# GITHUB_JOB=""
+# GITHUB_OUTPUT=""
+# GITHUB_PATH=""
+# GITHUB_REF=""
+# GITHUB_REF_NAME=""
+# GITHUB_REF_PROTECTED=""
+# GITHUB_REF_TYPE=""
+# GITHUB_REPOSITORY=""
+# GITHUB_REPOSITORY_ID=""
+# GITHUB_REPOSITORY_OWNER=""
+# GITHUB_REPOSITORY_OWNER_ID=""
+# GITHUB_RETENTION_DAYS=""
+# GITHUB_RUN_ATTEMPT=""
+# GITHUB_RUN_ID=""
+# GITHUB_RUN_NUMBER=""
+# GITHUB_SERVER_URL=""
+# GITHUB_SHA=""
+# GITHUB_STEP_SUMMARY=""
+# GITHUB_TRIGGERING_ACTOR=""
+# GITHUB_WORKFLOW=""
+# GITHUB_WORKFLOW_REF=""
+# GITHUB_WORKFLOW_SHA=""
+# GITHUB_WORKSPACE=""
+# RUNNER_ARCH=""
+# RUNNER_DEBUG=""
+# RUNNER_NAME=""
+# RUNNER_OS=""
+# RUNNER_TEMP=""
+# RUNNER_TOOL_CACHE=""

.gitignore

@@ -99,5 +99,4 @@ __tests__/runner/*
 
 # IDE files
 .idea
-.vscode
 *.code-workspace

.vscode/launch.json

@@ -0,0 +1,15 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Debug Action",
+      "type": "node",
+      "request": "launch",
+      "runtimeExecutable": "npx",
+      "cwd": "${workspaceRoot}",
+      "args": ["local-action", ".", "src/main.ts", ".env"],
+      "console": "integratedTerminal",
+      "skipFiles": ["<node_internals>/**", "node_modules/**"]
+    }
+  ]
+}

README.md

@@ -131,6 +131,34 @@ So, what are you waiting for? Go ahead and start customizing your action!
    > `ncc`, which will create a license file for all of the production node
    > modules used in your project.
 
+1. (Optional) Test your action locally
+
+   The [`@github/local-action`](https://github.com/github/local-action) utility
+   can be used to test your action locally. It is a simple CLI tool that "stubs"
+   (or simulates) the GitHub Actions Toolkit. This way, you can run your
+   TypeScript action locally without having to commit and push your changes to a
+   repository.
+
+   The `local-action` utility can be run in the following ways:
+
+   - VS Code Debugger
+
+     Make sure to review and, if needed, update
+     [`.vscode/launch.json`](./.vscode/launch.json)
+
+   - Terminal/Command Prompt
+
+     ```bash
+     # npx local action <action-yaml-path> <entrypoint> <dotenv-file>
+     npx local-action . src/main.ts .env
+     ```
+
+   You can provide a `.env` file to the `local-action` CLI to set environment
+   variables used by the GitHub Actions Toolkit. For example, setting inputs and
+   event payload data used by your action. For more information, see the example
+   file, [`.env.example`](./.env.example), and the
+   [GitHub Actions Documentation](https://docs.github.com/en/actions/learn-github-actions/variables#default-environment-variables).
+
 1. Commit your changes
 
    ```bash