Fix cppcheck skip logic on CI

Author: ankith26

.github/workflows/run-ubuntu-checks.yml

@@ -138,10 +138,18 @@ jobs:
 
     - name: Check if any src_c files changed
       id: check-changes
+      continue-on-error: true
       run: |
-        git fetch origin ${{ github.base_ref }} --depth=1 || true
-        git checkout ${{ github.base_ref }}
-        CHANGED_FILES=$(git diff --name-only origin/${{ github.base_ref }}...HEAD)
+        if [[ "${{ github.event_name }}" == "pull_request" ]]; then
+          git fetch origin ${{ github.base_ref }} --depth=1
+          git checkout ${{ github.base_ref }}
+          CHANGED_FILES=$(git diff --name-only origin/${{ github.base_ref }}...HEAD)
+        else
+          CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
+          git fetch origin "$CURRENT_BRANCH" --depth=2
+          CHANGED_FILES=$(git diff --name-only HEAD^1...HEAD)
+        fi
+        echo "Changed files: $CHANGED_FILES"
         echo "$CHANGED_FILES" | grep '^src_c/' || echo "skip=true" >> "$GITHUB_OUTPUT"
 
     - name: Install cppcheck