adding apt-get update before calling install in gha

Signed-off-by: Adam D. Cornett <[email protected]>

Author: acornett21

.github/workflows/validation.yml

@@ -23,7 +23,7 @@ jobs:
 
       - name: Install non-python dependencies
         run: |
-          sudo apt-get install -y libkrb5-dev
+          sudo apt-get update && sudo apt-get install -y libkrb5-dev
 
       - name: Install Hadolint via Brew
         run: |