Bot build: add workflow to publish docker container of headless-game-runner (bot) #1

	# Runs when master branch is updated.
	# Creates & pushes a docker container for bots.

	name: Master Branch Build - Build Bot Docker Container
	on:
	pull_request:
	push:
	branches:
	- master
	jobs:
	build:
	env:
	IS_MASTER_BUILD: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Set up JDK 11
	uses: actions/setup-java@v4
	with:
	distribution: temurin
	java-version: 11
	- name: Login to GitHub Container Registry
	if: ${{ env.IS_MASTER_BUILD }}
	uses: docker/login-action@v1
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	- name: build headless docker container
	if: ${{ env.IS_MASTER_BUILD }}
	run: \|
	./gradlew :game-app:game-headless:shadowJar
	docker build game-app/game-headless --tag ghcr.io/triplea-game/bot:latest
	docker push ghcr.io/triplea-game/bot:latest

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