config: delete variable only if it makes enough space to write new #52

	name: Build
	on:
	pull_request:
	types:
	- opened
	- edited
	- ready_for_review
	- reopened
	- synchronize
	push:
	workflow_dispatch:

	jobs:
	build:
	if: contains(github.event.head_commit.message, '[skip ci]') == false

	runs-on: ubuntu-20.04

	steps:
	- name: Checkout repository and submodules
	uses: actions/checkout@v3
	with:
	submodules: recursive

	- name: Package install
	run: \|
	sudo add-apt-repository ppa:tkchia/build-ia16
	sudo apt update
	sudo apt install gcc-ia16-elf libi86-ia16-elf nasm upx qemu-system-x86 mtools util-linux bash

	- name: build
	run: ./ci_build.sh

	- name: test
	run: ./ci_test.sh

	- name: make snapshot name
	id: snapshotname
	run: \|
	(
	today=`date -u +%F \| tr '\n' '-'`
	s_sha=`echo -n ${GITHUB_SHA} \| cut -c1-8`
	printf "fname=snapshot-%s%s\n" $today $s_sha >> $GITHUB_OUTPUT
	)

	- name: upload
	if: github.repository == 'FDOS/kernel' &&
	(github.event_name == 'push' \|\| github.event.pull_request.merged == true)
	uses: actions/upload-artifact@v3
	with:
	name: ${{ steps.snapshotname.outputs.fname }}
	path: _output//.???

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