Integrated example project for Mill into CI task #1

	name: Mill plugin tests

	on:
	push:
	paths:
	- modules/openapi-generator-mill-plugin/**
	pull_request:
	paths:
	- modules/openapi-generator-mill-plugin/**

	jobs:
	test:
	name: Mill plugin tests
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v5
	- name: Set up JDK 11
	uses: actions/setup-java@v5
	with:
	java-version: 11
	distribution: 'temurin'
	- name: Cache maven dependencies
	uses: actions/cache@v5
	env:
	cache-name: cache-maven-repository
	with:
	path: \|
	~/.m2/repository
	~/.gradle
	!~/.gradle/caches/*/plugin-resolution/
	!~/.m2/repository/org/openapitools/
	key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/pom.xml') }}
	restore-keys: \|
	${{ runner.os }}-test-mill-plugin-${{ env.cache-name }}-
	${{ runner.os }}-test-mill-plugin-
	- name: Run tests
	env:
	GRADLE_ENTERPRISE_ACCESS_KEY: ${{ secrets.GRADLE_ENTERPRISE_ACCESS_KEY }}
	run: \|
	./mvnw clean install -DskipTests -Dmaven.javadoc.skip=true
	(cd modules/openapi-generator-mill-plugin/example/ && ./mill __.compile)
	(cd modules/openapi-generator-mill-plugin/example/ && ./mill openapi.validate)
	(cd modules/openapi-generator-mill-plugin/example/ && ./mill validateOpenapiSpec $(pwd)/api/petstore-invalid.yaml)

Provide feedback