Add ccache Github workflow #15

	---
	name: build dnf5 with ccache to check for quick build errors
	on:
	pull_request:
	workflow_dispatch:

	jobs:
	build-with-ccache:
	runs-on: ubuntu-latest
	container:
	image: fedora:rawhide

	steps:
	- uses: actions/checkout@v3
	with:
	fetch-depth: 0

	- name: Install dependencies
	run: \|
	dnf install -y cmake ccache gcc-c++ libtoml

	- name: Prepare ccache timestamp
	id: ccache_cache_timestamp
	shell: cmake -P {0}
	run: \|
	string(TIMESTAMP current_date "%Y-%m-%d-%H;%M;%S" UTC)
	message("::set-output name=timestamp::${current_date}")

	- name: ccache cache files
	uses: actions/cache@v3
	with:
	path: .ccache
	key: ${ { matrix.config.name } }-ccache-${ { steps.ccache_cache_timestamp.outputs.timestamp } }
	restore-keys: \|
	${ { matrix.config.name } }-ccache-

	- name: Create ccache symlinks to prioritize it over gcc
	run: \|
	ln -s /usr/bin/ccache /usr/local/bin/gcc
	ln -s /usr/bin/ccache /usr/local/bin/g++
	ln -s /usr/bin/ccache /usr/local/bin/cc
	ln -s /usr/bin/ccache /usr/local/bin/c++

	- name: Build dnf5
	run: mkdir build; cmake --build build

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