Research faster git add filename approach

[KasperZutterman]

Research if there is a faster way to add the files with git add.
Context: adding generated files takes about as long as fetching data (10 min data fetching -> 10 min git add)

LDES-Action/src/main.ts

Lines 46 to 56 in eb15441

	// Calculate the differences with the previous result
	core.startGroup('Calculating diffstat');
	const editedFiles = [];
	for (const filename of editedFilenames) {
	core.debug(`git adding ${filename}…`);
	await exec('git', ['add', filename]);
	editedFiles.push({
	name: filename,
	});
	}
	core.endGroup();