Add model signing unit test GitHub Actions #2

	name: Unit tests for model signing
	on:
	push:
	branches: [main]
	pull_request:
	branches: [main]
	types: [opened, synchronize]

	permissions:
	id-token: write

	jobs:
	sign-model:
	name: Test model signing still works
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
	- uses: actions/setup-python@65d7f2d534ac1bc67fcd62888c5f4f3d2cb2b236 # v4.7.1
	with:
	python-version: 3.11
	cache: pip
	cache-dependency-path: model_signing/install/requirements.txt
	- name: Install dependencies
	run: \|
	set -euo pipefail
	python -m venv venv
	source venv/bin/activate
	python -m pip install --require-hashes -r model_signing/install/requirements.txt
	- name: Download bertseq2seq
	run: \|
	set -euo pipefail
	wget "https://tfhub.dev/google/bertseq2seq/bert24_en_de/1?tf-hub-format=compressed" -O bertseq2seq.tgz
	mkdir -p bertseq2seq
	pushd bertseq2seq
	tar xvzf ../bertseq2seq.tgz
	popd
	rm -rf bertseq2seq.tgz
	- name: Sign bertseq2seq model
	run: \|
	set -euo pipefail
	source venv/bin/activate
	python3 model_signing/main.py sign --path bertseq2seq
	- name: Verify signature of bertseq2seq model
	run: \|
	set -euo pipefail
	source venv/bin/activate
	python3 model_signing/main.py verify --path bertseq2seq --identity https://github.com/${{ github.workflow_ref }} --identity-provider https://token.actions.githubusercontent.com

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