[ci] Add 'file' to reqs.txt for debian-stable and debian-testing #571

	name: Alpine Linux

	on:
	push:
	branches: [ main ]
	paths-ignore:
	- AUTHORS.md
	- CC-BY-4.0.txt
	- CHANGES.md
	- CODE_OF_CONDUCT.md
	- CONTRIBUTING.md
	- COPYING
	- COPYING.LIB
	- HISTORY
	- LICENSE-2.0.txt
	- MISSING
	- MIT.txt
	- README.md
	- RELEASE
	- TODO
	- 'contrib/**'
	- 'data/**'
	- 'doc/**'
	- 'po/**'
	- 'regress/**'

	jobs:
	linux:
	# Use containers on their ubuntu latest image
	runs-on: ubuntu-latest

	# Set up the matrix of distributions to test
	strategy:
	matrix:
	container: ["alpine:latest"]

	container:
	image: ${{ matrix.container }}

	# All of these steps run from within the main source
	# directory, so think of that as your $PWD
	steps:
	# Requirements before the git clone can happen
	# (The git config step here is to deal with an unusual
	# error seen only on Alpine Linux. You shouldn't normally
	# do this.)
	- name: git clone requirements
	run: \|
	apk add git

	# This means clone the git repo
	- uses: actions/checkout@v4

	# Within the container, install the dependencies, build,
	# and run the test suite
	- name: Build and run the test suite
	run: \|
	# Install make(1) so we can use the instreqs target
	apk add make

	# Install build dependencies and set up the target
	make instreqs

	# Build the software and run the test suite
	make debug
	make check
	ninja -C build coverage && ( curl -s https://codecov.io/bash \| bash ) \|\| :

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