Update readme and include docs

This PR updates the README to include documentation about the soundness workflow and how to run actions locally.

Author: FranzBusch

README.md

@@ -1,12 +1,50 @@
 # GitHub Actions Workflows
 
-This repository will contain reusable workflows to minimize redundant workflows across the organization. This effort will also facilitate the standardization of testing processes while empowering repository code owners to customize their testing plans as needed. The repository will contain workflows to support different types of repositories, such as Swift Package and Swift Compiler.
+This repository will contain reusable workflows to minimize redundant workflows
+across the organization. This effort will also facilitate the standardization of
+testing processes while empowering repository code owners to customize their
+testing plans as needed. The repository will contain workflows to support
+different types of repositories, such as Swift Package and Swift Compiler.
 
-For more details on reusable workflows, please refer to the [Reusing workflows](https://docs.github.com/en/actions/using-workflows/reusing-workflows) section in the GitHub Docs.
+For more details on reusable workflows, please refer to the [Reusing
+workflows](https://docs.github.com/en/actions/using-workflows/reusing-workflows)
+section in the GitHub Docs.
 
 ## Reusable workflow for Swift package repositories
 
-To enable pull request testing for all supported Swift versions (5.8, 5.9, 5.10, 6.0, and nightly) on Linux, add the following code example in `.github/workflows/pull_request.yml`:
+There are different kinds of workflows that this repository offers:
+
+### Soundness
+
+The soundness workflows provides a multitude of checks to ensure a repository is
+following the best practices. By default each check is enabled but can be
+disabled by passing the appropriate workflow input. We recommend to adopt all
+soundness checks and enforce them on each PR.
+
+A recommended workflow looks like this:
+
+```yaml
+name: Pull request
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+
+jobs:
+  soundness:
+    name: Soundness
+    uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main
+    with:
+      license_header_check_project_name: "Swift.org"
+```
+
+### Testing
+
+> ⚠️ This is workflow is currently under active development
+
+To enable pull request testing for all supported Swift versions (5.8, 5.9, 5.10,
+6.0, and nightly) on Linux, add the following code example in
+`.github/workflows/pull_request.yml`:
 
 ```yaml
 name: pull_request
@@ -21,16 +59,53 @@ jobs:
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
 ```
 
-If your package only supports newer compiler versions, you can exclude older versions by using the `exclude_swift_versions` workflow input:
+If your package only supports newer compiler versions, you can exclude older
+versions by using the `exclude_swift_versions` workflow input:
 
 ```yaml
 exclude_swift_versions: "[{\"swift_version\": \"5.8\"}]"
 ```
 
-Additionally, if your package requires additional installed packages, you can use the `pre_build_command`:
+Additionally, if your package requires additional installed packages, you can
+use the `pre_build_command`:
 
 ```yaml
 pre_build_command: "apt-get update -y -q && apt-get install -y -q example"
 ```
 
 macOS and Windows platform support will be available soon.
+
+## Running workflows locally
+
+You can run the Github Actions workflows locally using
+[act](https://github.com/nektos/act). To run all the jobs that run on a pull
+request, use the following command:
+
+```bash
+% act pull_request
+```
+
+To run just a single job, use `workflow_call -j <job>`, and specify the inputs
+the job expects. For example, to run just shellcheck:
+
+```bash
+% act workflow_call -j soundness --input shell_check_enabled=true
+```
+
+To bind-mount the working directory to the container, rather than a copy, use
+`--bind`. For example, to run just the formatting, and have the results
+reflected in your working directory:
+
+```bash
+% act --bind workflow_call -j soundness --input format_check_enabled=true
+```
+
+If you'd like `act` to always run with certain flags, these can be be placed in
+an `.actrc` file either in the current working directory or your home
+directory, for example:
+
+```bash
+--container-architecture=linux/amd64
+--remote-name upstream
+--action-offline-mode
+```