Edit Dockerfile.model to use --platform #151

	name: Build object-detector-python application

	on:
	push:
	paths:
	- 'object-detector-python/**'
	- '!object-detector-python/README.md'
	- '.github/workflows/object-detector-python.yml'
	pull_request:

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	include:
	- chip: cpu
	- chip: artpec8
	env:
	EXREPO: acap-computer-vision-examples
	EXNAME: object-detector-python
	steps:
	- uses: actions/checkout@v2
	- uses: docker/setup-buildx-action@v2
	with:
	install: true
	- name: Build ${{ env.example }} application
	env:
	example: ${{ env.EXNAME }}-${{ matrix.chip }}
	imagetag: ${{ env.EXREPO }}_${{ env.EXNAME }}-${{ matrix.chip }}:1.0
	modeltag: ${{ env.EXREPO }}_${{ env.EXNAME }}-${{ matrix.chip }}-model:1.0
	run: \|
	cd $EXNAME
	docker run --rm --privileged multiarch/qemu-user-static --credential yes --persistent yes
	docker build --no-cache --build-arg CHIP=${{ matrix.chip }} --tag $imagetag .
	docker build --file Dockerfile.model --tag $modeltag .

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