[ovs-git] [ovn-org/ovn] 08252f: github: Fix Ubuntu package installation.

[David Marchand]

  Branch: refs/heads/branch-20.09
  Home:   https://github.com/ovn-org/ovn
  Commit: 08252f3a295cc1c5e36310acac3049a91a9b7d78
      https://github.com/ovn-org/ovn/commit/08252f3a295cc1c5e36310acac3049a91a9b7d78
  Author: David Marchand <david.marchand at redhat.com>
  Date:   2020-12-21 (Mon, 21 Dec 2020)

  Changed paths:
    M .github/workflows/test.yml

  Log Message:
  -----------
  github: Fix Ubuntu package installation.

Before trying to install a package, APT cache must be updated to avoid
asking for an unavailable version of a package.

Fixes: ecdd790ecbff("CI: Add github actions workflow.")
Signed-off-by: David Marchand <david.marchand at redhat.com>
Signed-off-by: Numan Siddique <numans at ovn.org>

(cherry-picked from master commit 119dcbeb1205aad002953e1ecef154c775912b42)