Add protocol for estimator builder #62

	name: License Header Check

	on: [pull_request, workflow_dispatch]

	defaults:
	run:
	shell: bash

	jobs:
	check-license-headers:
	name: Check License Headers
	runs-on: ubuntu-latest

	steps:
	- name: Checkout
	uses: actions/checkout@v4
	with:
	fetch-depth: 0
	lfs: false

	- name: Check license headers
	run: \|
	expected_header_1="# This file is part of sbi, a toolkit for simulation-based inference. sbi is licensed"
	expected_header_2="# under the Apache License Version 2.0, see <https://www.apache.org/licenses/>"

	invalid_files=()

	while IFS= read -r file; do
	file_header_1=$(head -n 1 "$file")
	file_header_2=$(head -n 2 "$file" \| tail -n 1)

	invalid=false

	# Check the first line
	if [ "$file_header_1" != "$expected_header_1" ]; then
	invalid=true
	fi

	# Check the second line
	if [ "$file_header_2" != "$expected_header_2" ]; then
	invalid=true
	fi

	# If either line is invalid, add to the list
	if [ "$invalid" = true ]; then
	invalid_files+=("$file")
	fi

	done < <(find sbi tests -name "*.py" -type f)

	# Report results
	if [ ${#invalid_files[@]} -ne 0 ]; then
	echo "❌ Missing or incorrect license headers in the following files:"
	for file in "${invalid_files[@]}"; do
	echo " $file"
	done
	echo "Make sure the following two lines are provided and correctly spelled at the very start of all above listed files"
	echo "$expected_header_1"
	echo "$expected_header_2"
	exit 1
	else
	echo "✅ All files have the correct license headers."
	exit 0
	fi

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