deps(nodejs): require exactly v 16.9.1

[agustibr]

Description

This pr tries to fix the deployment issue with nodejs:

• updated .github/workflows/test.yml to use the node version
• added .npmrc file to prevent npm to install not supported Node.js versions more info
• added engines entry to package.json with node version.

This is the error raised when deploying with capistrano:

The deploy has failed with an error: Exception while executing as decidim@168.119.180.57: cd /home/decidim/decidim-coincidim/releases/20220321094132; npm ci exit status: 137
cd /home/decidim/decidim-coincidim/releases/20220321094132; npm ci stdout: Nothing written
cd /home/decidim/decidim-coincidim/releases/20220321094132; npm ci stderr: npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@decidim/core@0.26.0',
npm WARN EBADENGINE   required: { node: '^16.9.1', npm: '^7.21.1' },
npm WARN EBADENGINE   current: { node: 'v16.14.0', npm: '8.3.1' }
npm WARN EBADENGINE }