chore(deps): update cachix/install-nix-action action to v26 #5

	name: Nix Flake actions

	on:
	pull_request:
	push:
	branches:
	- master
	- main

	jobs:
	nix-matrix:
	runs-on: ubuntu-latest
	outputs:
	matrix: ${{ steps.set-matrix.outputs.matrix }}
	steps:
	- uses: actions/checkout@v4
	- uses: cachix/install-nix-action@v26
	- id: set-matrix
	name: Generate Nix Matrix
	run: \|
	set -euo pipefail
	matrix="$(nix eval --json '.#githubActions.matrix')"
	echo "matrix=$matrix" >> "$GITHUB_OUTPUT"
	echo "$matrix" \| jq

	nix-build:
	needs: nix-matrix
	runs-on: ${{ matrix.os }}
	strategy:
	fail-fast: false # let it build all the targets
	matrix: ${{fromJSON(needs.nix-matrix.outputs.matrix)}}
	steps:
	# Make space for large NixOS closures
	- name: Free disk space
	run: \|
	sudo rm -rf \
	/usr/local/lib/android \
	/opt/ghc \
	/usr/local/.ghcup \
	"$AGENT_TOOLSDIRECTORY" \
	\|\| true
	- uses: actions/checkout@v4
	- uses: cachix/install-nix-action@v26
	- uses: cachix/cachix-action@v14
	with:
	name: snowflake
	authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
	- run: nix build -L ".#githubActions.checks.${{ matrix.attr }}"

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