Add comments to the `Installing KLayout` step.

Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>

.github/workflows/Tests.yml

diff --git a/.github/workflows/Tests.yml b/.github/workflows/Tests.yml
index 1a532d0..226fc27 100644
--- a/.github/workflows/Tests.yml
+++ b/.github/workflows/Tests.yml
@@ -57,8 +57,13 @@
         run: |
           sudo apt update -qq -y
           wget https://www.klayout.org/downloads/Ubuntu-22/klayout_0.28.2-1_amd64.deb
+          # The dpkg command will fail complaining about missing dependencies.
           sudo dpkg -i ./klayout_0.28.2-1_amd64.deb || true
+          # The apt install command should install the missing dependencies
+          # needed by KLayout above and finish the install.
           sudo apt install -f -y
+          # Check that KLayout was successfully installed!
+          klayout -h
 
       - uses: actions/checkout@v3