ci: staking-miner-playground check only if changed #2

	name: Polkadot Staking Miner Playground CI

	on:
	pull_request:
	branches:
	- main
	paths:
	- 'staking-miner-playground/**'

	env:
	IMAGE: paritytech/ci-unified:bullseye-1.77.0-2024-04-10-v20240408
	IMAGE_NAME: paritytech/polkadot-staking-miner
	RUST_INFO: rustup show && cargo --version && rustup +nightly show && cargo +nightly --version

	concurrency:
	group: ${{ github.workflow }}-${{ github.event.pull_request.number \|\| github.ref }}
	cancel-in-progress: true

	jobs:
	set-image:
	# GitHub Actions does not allow using 'env' in a container context.
	# This workaround sets the container image for each job using 'set-image' job output.
	runs-on: ubuntu-latest
	outputs:
	IMAGE: ${{ steps.set_image.outputs.IMAGE }}
	steps:
	- id: set_image
	run: echo "IMAGE=${{ env.IMAGE }}" >> $GITHUB_OUTPUT

	check:
	name: Check staking-miner-playground
	runs-on: ubuntu-latest
	needs: [set-image]
	container: ${{ needs.set-image.outputs.IMAGE }}
	steps:
	- name: Checkout repository
	uses: actions/checkout@v4

	- name: Cache Rust dependencies
	uses: swatinem/rust-cache@v2
	with:
	key: ${{ runner.os }}-rust-${{ hashFiles('**/Cargo.lock') }}

	- name: Check staking-miner-playground
	run: \|
	${{ env.RUST_INFO }}
	cargo check --manifest-path staking-miner-playground/Cargo.toml

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