feat: begin building plugin with node instead of bash (#1120)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
- Enhanced automated build and release processes with containerized
builds, improved caching, and refined artifact handling.
- Introduced new configuration options to strengthen versioning,
integrity checks, and pull request tracking.
	- Added a new Dockerfile for building the Node.js application.
- Added new environment variables for API versioning and validation
control.
	- Implemented comprehensive management of PM2 processes and state.
- Introduced a new GitHub Actions workflow for automating staging plugin
deployment upon pull request closure.
	- Updated logic for handling plugin installation and error feedback.
	- Added new asynchronous methods for managing PM2 processes.
	- Updated logging configurations for better control over log outputs.
	- Added Prettier configuration for consistent code formatting.
- Introduced a configuration to prevent the application from watching
for file changes.

- **Bug Fixes**
- Improved error handling and user feedback during the installation of
staging versions.

- **Documentation**
- Removed outdated introductory documentation to streamline project
information.

- **Chores**
- Updated deployment routines and validation steps to improve release
consistency and error handling.
- Simplified packaging and build scripts for smoother staging and
production workflows.
	- Excluded sensitive files from the Docker build context.
- Updated the `.gitignore` file to prevent unnecessary files from being
tracked.
- Adjusted the test timeout configuration for improved test reliability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

plugin/.env.example

@@ -0,0 +1,8 @@
+# API version in semver format (required)
+API_VERSION=3.11.1
+# SHA256 hash of the API package (required)
+API_SHA256=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+# Pull request number for PR builds (optional)
+PR=35
+# Skip source validation (default: true for local testing)
+SKIP_SOURCE_VALIDATION=true