fix wrong java version in docker file #4

	name: Testing CI pipeline

	on: push

	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0
	- name: Set up JDK 21
	uses: actions/setup-java@v4
	with:
	java-version: '21'
	distribution: 'temurin'
	- name: Validate Gradle wrapper
	uses: gradle/wrapper-validation-action@v2
	- name: Run chmod to make gradlew executable
	run: chmod +x gradlew
	- name: Cache SonarCloud packages
	uses: actions/cache@v4
	with:
	path: ~/.sonar/cache
	key: ${{ runner.os }}-sonar
	restore-keys: ${{ runner.os }}-sonar
	- name: Execute tests
	env:
	SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
	uses: gradle/gradle-build-action@v3
	with:
	arguments: cleanTest test jacocoTestReport sonar

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