Use setup-bazel GHA for disk and repository caching #174

	# SPDX-License-Identifier: BSD-3-Clause

	name: Continuous Integration

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

	jobs:
	bazel_test:
	runs-on: ubuntu-latest
	env:
	# This is where bazelisk caches its downloads of Bazel.
	BAZELISK_HOME: /home/runner/.cache/bazel_ci/bazelisk
	steps:
	- uses: actions/checkout@v6
	- name: Install Ubuntu dependencies
	run: .github/ci_setup.bash
	# TODO: explain the setup-bazel params below
	- uses: bazel-contrib/setup-bazel@0.15.0
	with:
	# Avoid downloading Bazel every time.
	bazelisk-cache: true
	# Store build cache globally
	disk-cache: true
	# Share repository cache globally as well.
	repository-cache: ""
	- name: Report cache sizes
	run: \|
	du -ms ~/.cache/* \|\| true
	# Actual testing.
	- name: Bazel Test
	run: \|
	ln -s .github/ci.bazelrc user.bazelrc
	bazelisk test //...

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