fix: arch version and reduce docker image size and caching #408

	name: OpenGL

	on:
	push:
	branches: [main]
	paths:
	- "src/**"
	- "assets/shaders/**"
	- "config/**"
	pull_request:
	branches: [main]

	concurrency:
	group: opengl-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	changes:
	name: Detect OpenGL-related changes
	runs-on: ubuntu-latest
	outputs:
	relevant: ${{ steps.filter.outputs.relevant }}

	steps:
	- name: Checkout repository
	uses: actions/checkout@v6
	with:
	fetch-depth: 0

	- name: Detect relevant file changes
	id: filter
	shell: bash
	run: \|
	if [ "${{ github.event_name }}" != "pull_request" ]; then
	echo "relevant=true" >> "$GITHUB_OUTPUT"
	exit 0
	fi

	if git diff --name-only "${{ github.event.pull_request.base.sha }}" "${{ github.event.pull_request.head.sha }}" \| grep -Eq '^(src/\|assets/shaders/\|config/)'; then
	echo "relevant=true" >> "$GITHUB_OUTPUT"
	else
	echo "relevant=false" >> "$GITHUB_OUTPUT"
	fi

	shader-validation:
	name: Shader Validation
	needs: changes
	if: needs.changes.outputs.relevant == 'true'
	runs-on: ubuntu-latest

	steps:
	- name: Checkout repository
	uses: actions/checkout@v6
	with:
	fetch-depth: 1

	- name: Install glslang
	run: sudo apt-get update && sudo apt-get install -y glslang-tools

	- name: Validate GLSL shaders
	run: \|
	SHADERS=$(find assets/shaders -type f $ -name ".vert" -o -name ".frag" -o -name ".geom" -o -name ".comp" $)
	echo "Found $(echo "$SHADERS" \| wc -l) shaders"
	echo "$SHADERS" \| xargs glslangValidator

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