Add github action cache for redis-server binary #320

	name: CI
	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]
	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	go: [ '1.17', '1.20', '1.21', '1.22' ]
	name: Go ${{ matrix.go }}
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-go@v4
	with:
	go-version: ${{ matrix.go }}

	- name: Cache redis server binary restore
	id: cache-redis-server-binary-restore
	uses: actions/cache/restore@v4
	with:
	path: integration/redis_src/redis-server
	key: "redis-server-binary-${{ hashFiles('integration/get_redis.sh') }}"

	- name: Prevent redis binary rebuild
	if: steps.cache-redis-server-binary-restore.outputs.cache-hit
	run: "touch -m integration/redis_src/redis-server"
	# Make uses modification timestamp to decide if redis-server needs to be rebuilt.
	# In github actions get_redis.sh has modification time set when cloned but redis-server binary has modification
	# time when it was cached (always older than clone). By updating timestamp we avoid unnecessary build.
	# Cache key includes get_redis.sh file hash so there is no risk of using stale binary.

	- name: Test
	run: make ci

	- name: Cache redis server binary save
	if: steps.cache-redis-server-binary-restore.outputs.cache-hit != 'true'
	uses: actions/cache/save@v4
	with:
	path: integration/redis_src/redis-server
	key: ${{ steps.cache-redis-server-binary-restore.outputs.cache-primary-key }}

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