added ability to override test_type and env_type #35

	name: Docker Image CI

	on:
	create:
	tags:
	- '*'
	push:
	branches: [ mvn-latest ]

	jobs:

	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	-
	name: Login to DockerHub
	uses: docker/login-action@v1
	with:
	username: ${{ secrets.DOCKER_LOGIN }}
	password: ${{ secrets.DOCKER_PASSWORD }}
	-
	name: Build
	run: \|
	docker build -t getcarrier/gatling_maven_runner:latest .
	-
	name: Push
	run: \|
	docker push getcarrier/gatling_maven_runner:latest

Provide feedback