Add a postinstall script to automaticlly build wp-rocket-scripts dist…

[MathieuLamiot]

… if needed

gitignore package-lock.json

Description

Follow up of #12 in rocket-scripts so that the rocket-scripts is automatically built after npm install, if needed.
This PR needs wp-media/rocket-scripts#19 as well to work properly.

Documentation

User documentation

When running npm install, rocket-scripts will be built automatically if we are targetting a dev branch and the dist/ files are not available.

Technical documentation

NA

Type of change

Delete options that are not relevant.

• New feature (non-breaking change which adds functionality).
• Bug fix (non-breaking change which fixes an issue).
• Enhancement (non-breaking change which improves an existing functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as before).

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for 2cdeb581	✅ ∅ (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (2cdeb58)	Report Missing	Report Missing	Report Missing
Head commit (2aa2bf0)	37567	14273	37.99%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#6871)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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Footnotes

1. Codacy didn't receive coverage data for the commit, or there was an error processing the received data. Check your integration for errors and validate that your coverage setup is correct. ↩