feat: add PR builder #1

	name: PR Builder

	on:
	pull_request:
	types: [opened, synchronize, reopened]

	jobs:
	check-and-build:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@v3
	with:
	fetch-depth: 0 # Fetch all history for all branches and tags

	- name: Get changed files
	id: changed-files
	uses: tj-actions/changed-files@v39

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v2

	- name: Cache Docker layers
	uses: actions/cache@v3
	with:
	path: /tmp/.buildx-cache
	key: ${{ runner.os }}-buildx-${{ hashFiles('.cfg/Dockerfile') }}
	restore-keys: \|
	${{ runner.os }}-buildx-

	- name: Build toolchain
	uses: docker/build-push-action@v4
	with:
	context: .
	file: .cfg/Dockerfile
	load: true
	tags: aarch64_musl_cross:v1.0
	cache-from: type=local,src=/tmp/.buildx-cache
	cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max

	- name: Move cache
	run: \|
	rm -rf /tmp/.buildx-cache
	mv /tmp/.buildx-cache-new /tmp/.buildx-cache

	- name: Find folders with build.sh and run build script
	run: \|
	folders_to_build=()
	for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
	dir=$(dirname "$file")
	if [[ "$dir" != "." && -f "$dir/build.sh" && ! " ${folders_to_build[@]} " =~ " $dir " ]]; then
	folders_to_build+=("$dir")
	fi
	done

	if [ ${#folders_to_build[@]} -gt 0 ]; then
	echo "Running build script for folders: ${folders_to_build[*]}"
	chmod +x build.sh
	./build.sh "${folders_to_build[@]}"
	else
	echo "No folders with build.sh were changed in this PR."
	fi

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