* Add section to CONTRIBUTING.md for testing Docker build workflows

  - Add instructions for contributors to test Docker build workflows in their forks by creating a branch starting with `docker/`.
  - Include steps to test Docker build workflows.
  - Add information about the Salesforce Code of Conduct and license.

CONTRIBUTING.md

@@ -0,0 +1,33 @@
+# Contributing to Salesforce CLI
+
+Thank you for your interest in contributing to Salesforce CLI! We welcome contributions from the community and are excited to work with you.
+
+## Getting Started
+
+1. Fork the repository on GitHub.
+2. Clone your forked repository to your local machine.
+3. Create a new branch for your contribution.
+4. Make your changes and commit them with a clear and concise commit message.
+5. Push your changes to your forked repository.
+6. Open a pull request against the main repository.
+
+## Testing Docker Build Workflows
+
+We have introduced a new capability for contributors to test the Docker build workflows in their forks. You can now create a branch starting with `docker/` to trigger the test Docker build workflow. This workflow will run on all pushes in forks and publish to the local package registry in the repository.
+
+### Steps to Test Docker Build Workflows
+
+1. Create a new branch in your forked repository with a name starting with `docker/`.
+2. Make your changes to the Dockerfile or related workflows.
+3. Push your changes to the `docker/` branch.
+4. The test Docker build workflow will automatically run and publish the Docker images to the local package registry in the repository.
+
+## Code of Conduct
+
+Please note that this project is governed by the Salesforce Code of Conduct. By participating, you are expected to adhere to this code. Please report any unacceptable behavior to [[email protected]](mailto:[email protected]).
+
+## License
+
+By contributing to Salesforce CLI, you agree that your contributions will be licensed under the [BSD 3-Clause License](LICENSE.txt).
+
+Thank you for contributing to Salesforce CLI!