Coerce sources path to absolute path if necessary

[cgewecke]

• 0% coverage when using hardhat-foundry & foundry.toml is present #853
• hardhat issue 3961

The @nomicfoundation/hardhat-foundry plugin makes paths.sources relative but it needs to be absolute when piping instrumented sources into the compilation jobs subtask here:

solidity-coverage/plugins/hardhat.plugin.js

Lines 27 to 35 in 7ad7288

	// The source name here is actually the global name in the solc input,
	// but hardhat uses the fully qualified contract names.
	for (const [sourceName, source] of Object.entries(solcInput.sources)) {
	const absolutePath = path.join(config.paths.root, sourceName);
	// Patch in the instrumented source code.
	if (absolutePath in instrumentedSources) {
	source.content = instrumentedSources[absolutePath];
	}
	}

Also

• added hardhat-foundry to the nomiclabs project E2E
• added installation of foundry in CI
• run npx hardhat init-foundry

LGTM:

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (7ad7288) 96.36% compared to head (c439952) 96.27%.

Files	Patch %	Lines
plugins/resources/nomiclabs.utils.js	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #866      +/-   ##
==========================================
- Coverage   96.36%   96.27%   -0.10%     
==========================================
  Files          19       19              
  Lines        1019     1021       +2     
==========================================
+ Hits          982      983       +1     
- Misses         37       38       +1     

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[cgewecke]

cov drop is covered by added E2E test not included in measurements