fix #20 - Add GitHub Action to build and test on Windows, macOS, and Linux

[fantonangeli]

Closes #20
Closes #32

Summary

• Add a GitHub Actions workflow that runs build and test steps across Windows, macOS, and Linux to ensure cross-platform compatibility and prevent OS-specific regressions on Pull Requests.
• Set Syncpack as a package.json script and in CI for dependency versions mismatch check

Notes

I tested it locally with Act using main and handrey/monorepo-setup branch from PR: #36

Preview

https://github.com/serverlessworkflow/editor/actions/runs/23354221155

[Copilot]

Pull request overview

Adds CI automation and dependency consistency checks intended to ensure cross-platform (Windows/macOS/Linux) builds on PRs and main, while introducing pnpm/syncpack configuration for dependency management.

Changes:

• Added a new GitHub Actions workflow to install deps, run syncpack, and run a production build on Ubuntu/macOS/Windows.
• Added syncpack configuration + root scripts for dependency consistency checks/fixes.
• Added a pnpm-lock.yaml to support pnpm-based installs.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 6 comments.

File	Description
pnpm-lock.yaml	Adds pnpm lockfile (currently includes workspace importers for packages not present in this repo).
package.json	Adds syncpack scripts and pnpm recursive build scripts; adds syncpack devDependency.
.syncpackrc.json	Introduces syncpack policy for workspace and peer dependency consistency.
.github/workflows/ci_build.yaml	Adds a cross-OS CI job running pnpm install, dependency check, and build.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 5 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (1)

package.json:24

• The repo declares "engines": { "node": ">=20" }, but the new lockfile contains packages requiring Node ^20.19.0 || >=22.12.0 (e.g. oxlint / oxfmt). With the current engines range, users on Node 20.0–20.18 will satisfy package.json but fail installs at runtime. Consider tightening engines.node to match the strictest dependency requirement (or downgrading the deps that require 20.19+), and aligning the CI Node version accordingly so CI validates the supported range.

  "engines": {
    "node": ">=20"
  }

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 5 changed files in this pull request and generated 2 comments.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 5 changed files in this pull request and generated 1 comment.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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