/ci:tests: Run tests

Detects the stack and runs tests with the right command.

Stack detection

if [ -f "uv.lock" ]; then
  STACK="python"
elif [ -f "pnpm-lock.yaml" ] || [ -f "package.json" ]; then
  STACK="node"
elif [ -f "Cargo.toml" ]; then
  STACK="rust"
else
  STACK="unknown"
fi

Commands by stack