Extend formatting of .github/workflows/*.y(a)ml files

[jjohannes]

This is not completed yet. See comment:

hiero-gradle-conventions/src/main/kotlin/org.hiero.gradle.check.spotless-yaml.gradle.kts

Lines 7 to 15 in cf4c33d

	/*
	* Prettier requires NodeJS and NPM installed; however, the NodeJS Gradle plugin and Spotless do not yet
	* integrate with each other. Currently there is an open issue report against spotless.
	*
	* *** Please see for more information: https://github.com/diffplug/spotless/issues/728 ***
	*
	* The workaround provided in the above issue does not work in Gradle 7.5+ and therefore is not a viable solution.
	*/
	// prettier()

Independent of that, it does not seem to run at all right now. The corresponding spotless tasks are UP-TO-DATE despite changes to the files.

[jjohannes]

Problem is that some files have the extension yml and not yaml. 🤦

[jjohannes]

Finding yml is fixed in 0.1.1.

Using prettier() will be added in a later release.