[ci] Cache downloaded packages for GitHub actions

Speed up the "Install packages" step for each CI run by caching the
downloaded packages in /var/cache/apt.

Do not include libc6-dbg:i386 within the cache, since apt seems to
complain if asked to download both gcc-aarch64-linux-gnu and
libc6-dbg:i386 at the same time.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
1 file changed
tree: 2e96cfa7bd43ac03c039846f302bd44a24d846b5
  1. .github/
  2. contrib/
  3. src/
  4. COPYING
  5. COPYING.GPLv2
  6. COPYING.UBDL
  7. README