Background

The Check Compatibility CI job was failing at the "Install GitHub CLI" step with exit code 100. This blocked all PR merges.

Problem

The CI container vsaglib/vsag:ci-x86 had issues with the manual gh installation script due to apt source configuration problems.

Solution

1. Pre-install gh in the CI Docker image (Dockerfile.x86)
2. Use the official GitHub CLI action cli/action@v1 instead of manual installation

Changes

• docker/Dockerfile.x86: Add gh to apt install
• .github/workflows/check_compatibility.yml: Replace manual installation with uses: cli/action@v1

Benefits

• Eliminates CI failure at gh installation step
• Reduces CI runtime (no need to install gh each run)
• Uses officially maintained action for better stability