Added Checkstyle GitHub Actions #835

	name: JavaDoc Generation on PR

	on:
	pull_request:
	branches: [ main ]

	env:
	GRADLE_OPTS: "-Dscan.link.VCS=${{ github.event.pull_request.html_url }}"

	jobs:
	java_doc_pr:
	runs-on: ubuntu-latest

	outputs:
	mmRepo: ${{ steps.find_mm.outputs.mmRepo }}
	mmBranch: ${{ steps.find_mm.outputs.mmBranch }}

	steps:
	- name: Checkout Data Repo
	uses: actions/checkout@v6
	with:
	repository: megamek/mm-data
	path: mm-data

	- name: Checking out MegaMekLab
	uses: actions/checkout@v6
	with:
	path: megameklab

	- name: Find the Right MegaMek Branch
	id: find_mm
	shell: bash {0}
	run: \|
	git ls-remote --exit-code --heads ${{ github.event.pull_request.head.repo.owner.html_url }}/megamek.git ${{ github.event.pull_request.head.ref }}
	if [ "$?" == "0" ]
	then
	echo "mmRepo=${{ github.event.pull_request.head.repo.owner.login }}/megamek" >> $GITHUB_OUTPUT
	echo "mmBranch=${{ github.event.pull_request.head.ref }}" >> $GITHUB_OUTPUT
	else
	echo "mmRepo=MegaMek/megamek" >> $GITHUB_OUTPUT
	echo "mmBranch=main" >> $GITHUB_OUTPUT
	fi
	exit 0

	- name: Checkout MegaMek
	uses: actions/checkout@v6
	with:
	repository: ${{ steps.find_mm.outputs.mmRepo }}
	ref: ${{ steps.find_mm.outputs.mmBranch }}
	path: megamek

	- name: Set up Temurin JDK 17
	uses: actions/setup-java@v5
	with:
	distribution: temurin
	java-version: 17

	- name: Setup Gradle
	uses: gradle/actions/setup-gradle@v5
	with:
	build-scan-publish: true
	build-scan-terms-of-use-url: "https://gradle.com/terms-of-service"
	build-scan-terms-of-use-agree: "yes"

	- name: Build with Gradle
	working-directory: megamek
	run: ./gradlew javadoc

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