Allow shell script and .pkg file extension (microsoft#14398)

Author: rikenm1

.github/workflows/check-files.yml

@@ -96,8 +96,8 @@ jobs:
           
           # Additional checks for binary files and large files
           if [[ -f "$file" ]]; then
-            # Check if file is binary
-            if file "$file" | grep -q "binary\|executable\|archive\|compressed"; then
+            # Check if file is binary (but allow .sh files even if executable)
+            if [[ "$extension" != "sh" ]] && file "$file" | grep -q "binary\|executable\|archive\|compressed"; then
               should_be_in_blob_store=true
             fi
             

.github/workflows/disallowed-extensions.txt

@@ -53,7 +53,6 @@ aac
 rpm
 deb
 msi
-pkg
 dmg
 iso