Fix virtual package parsing to prevent invalid cache entries#171

Copilot wants to merge 8 commits intomasterawalsh128/cache-apt-pkgs-action:masterfrom

copilot/fix-3a5d64e3-6924-4fd5-bd1d-4f4014a65826awalsh128/cache-apt-pkgs-action:copilot/fix-3a5d64e3-6924-4fd5-bd1d-4f4014a65826Copy head branch name to clipboard