config: Make sure nf_tables.ko is built #6

	# This job builds test kernels and uploads them to the `assets` dummy release.
	#
	# It works by looking at the KERNELS file in the repository and checks it
	# against all the already-uploaded kernels.

	name: Kernels

	on:
	push:
	branches: [ "master" ]

	concurrency:
	# Ensure only a single instance of this job is run at any time
	group: ${{ github.ref }}

	permissions:
	contents: write

	jobs:
	build-upload:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3

	- name: Calculate needed kernels
	id: calculate
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	run: \|
	existing=$(gh release view assets --json assets --jq '.[][].name')

	# Begin multiline output parameter
	echo "NEEDED_KERNELS<<MULTILINE_EOF" >> "$GITHUB_OUTPUT"

	echo "$existing" \| python3 -c '
	import sys

	# Calculate kernels that have already been uploaded
	existing = {line.strip() for line in sys.stdin}
	with open("./KERNELS", "r") as f:
	lines = {line.strip() for line in f if line.strip()}

	# Print to stdout kernel we need to build and upload
	for line in lines:
	version = line.strip()
	name = f"linux-{version}.tar.zst"
	if name not in existing:
	print(line)
	' \| tee -a "$GITHUB_OUTPUT"

	# End multiline output parameter
	echo "MULTILINE_EOF" >> "$GITHUB_OUTPUT"

	- name: Build needed kernels
	run: \|
	while IFS= read -r version; do
	echo "Building: ${version}"
	./build.sh "$version"
	done <<< "${{ steps.calculate.outputs.NEEDED_KERNELS }}"

	- name: Upload freshly built kernels
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	run: \|
	for kernel in linux-*; do
	gh release upload assets "$kernel"
	done

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