Add Multi-Arch support

[vidplace7]

Utilize docker-qemu to build/test against any platform supported by ESPHome.

Example workflow config using this action:

jobs:
  ci-multiarch:
    name: Build ${{ matrix.file }} - ${{ matrix.platform }} - ESPHome ${{ matrix.version }}
    runs-on: ubuntu-latest
    continue-on-error: ${{ matrix.accept_failure || false }}
    strategy:
      fail-fast: false
      matrix:
        file:
          - esp32-wemos-c3-mini.yaml
          - esp32-wemos-s2-mini.yaml
          - esp8266-wemos-d1-mini.yaml
        version:
          - latest
        platform:
          - linux/amd64
          - linux/arm64
          - linux/arm/v7
        include:
          - platform: linux/arm/v7
            accept_failure: true
    steps:
      - name: Checkout source code
        uses: actions/checkout@v3
      - name: Build ESPHome firmware to verify configuration
        uses: vidplace7/esphome-build-action@feature-multiarch
        with:
          yaml_file: ${{ matrix.file }}
          version: ${{ matrix.version }}
          platform: ${{ matrix.platform }}

Example run using this configuration:
https://github.com/vidplace7/esphome-wemos/actions/runs/3726832437/jobs/6320535854