ci: adjust and add comments

Author: Rafid Bin Mostofa

.github/scripts/removed-slices/removed-slices

@@ -24,7 +24,7 @@ oldref="$1"
 curref="$(git rev-parse --short HEAD)"
 exitcode=0
 
-# Check for deleted or renamed slice definition files and error out early.
+# Check for deleted or renamed slice definition files.
 deleted_files=()
 while IFS= read -r f; do
   deleted_files+=( "$f" )

.github/workflows/removed-slices.yaml

@@ -41,4 +41,7 @@ jobs:
       - name: "Check for removed slices"
         run: |
           ln -s "${{ env.files_main }}/.github/scripts/removed-slices/removed-slices" .
+          # For pull request events, use github.base_ref as the old git ref.
+          # For push events, the github.event.before value contains the SHA of
+          # the most recent commit on ref before the push.
           ./removed-slices "${{ github.base_ref || github.event.before }}"