CI: align workflows with python-proxy-headers and add release skill #4

	# Integration tests against a real proxy (PROXY_URL). Add repository secret PROXY_URL
	# under Settings → Secrets and variables → Actions, then mark this workflow as a required
	# status check under branch protection (pull_request events only receive secrets for PRs
	# from the same repository, not from forks).

	name: Proxy integration tests

	on:
	pull_request:

	permissions:
	contents: read

	jobs:
	integration:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v6
	with:
	persist-credentials: false

	- name: Set up Python
	uses: actions/setup-python@v6
	with:
	python-version: "3.x"

	- name: Install package and dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -e .
	pip install -r requirements.txt

	- name: Require PROXY_URL Actions secret
	env:
	PROXY_URL: ${{ secrets.PROXY_URL }}
	run: \|
	if [ -z "${PROXY_URL}" ]; then
	echo "::error::PROXY_URL is not set. Add a repository (or environment) secret named PROXY_URL under Settings → Secrets and variables → Actions."
	exit 1
	fi

	- name: Run integration tests
	env:
	PROXY_URL: ${{ secrets.PROXY_URL }}
	run: python test_proxy_headers.py

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