v1.3

add ability to specify a another Dockerfile (#4)

Initial Release

Usage:

name: Docker

on: [push]

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v1

      - name: Docker Build
        uses: benjlevesque/actions-docker-gcr/build@master

      - name: Docker Push
        uses: benjlevesque/actions-docker-gcr/push@master
        env:
          GCLOUD_SERVICE_ACCOUNT_KEY: ${{ secrets.GCLOUD_SERVICE_ACCOUNT_KEY }}