CI: add condition for temp docker build #32

	name: Test Build-Env Docker Image
	concurrency:
	group: ${{ github.workflow }}-${{ github.event.pull_request.number \|\| github.sha }}
	cancel-in-progress: true

	on:
	workflow_dispatch:
	pull_request:
	branches: master
	paths:
	- 'docker/**'
	- '!**.md'
	- '**docker-test.yml'

	jobs:
	build-test-env-image:
	runs-on: ubuntu-latest
	env:
	SOURCE_ROOT: ${{ github.workspace }}
	ENTRYPOINT: ${{ github.workspace }}/docker/default-entry.sh
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Set variables
	run: \|
	echo "OWNER_LC=${OWNER,,}" >>${GITHUB_ENV}
	echo "IMAGE=ghcr.io/${OWNER_LC}/vs-fltk:build-env" >>${GITHUB_ENV}

	- name: Install dependencies
	run: sudo apt install -y docker-compose

	- name: Check if Dockerfile has changed
	run: \|
	FILES=$(git log -1 -p ./ \| grep +++ \| cut -d '/' -f 2-\| sed -e 's\|dev/null\|\|g')
	if echo "$FILES" \| grep -qE "^(Dockerfile)$"; then
	echo "changed=true" >> $GITHUB_ENV
	else
	echo "changed=false" >> $GITHUB_ENV
	fi

	- name: Build Docker image
	if: ${{ env.changed == 'true' }}
	run: docker build -t $IMAGE -f docker/Dockerfile ./docker

	- name: Run commands in Docker container
	run: \|
	export HOSTUID=$(id -u)
	export HOSTGID=$(id -g)
	docker-compose -f docker/docker-compose.yml run --rm dev

Provide feedback