Fix REPO_LIST_FILE path resolution when processing repos

Convert REPO_LIST_FILE to an absolute path before starting the repo
processing loop. This fixes the error where the file couldn't be found
when the script changes into cloned repository directories.

The issue occurred because:
- REPO_LIST_FILE was a relative path (feature_branch_repos.yaml)
- When cd-ing into each repo's temp directory, the relative path became invalid
- The skip_makefile_changes check failed with "no such file or directory"

Solution: Use realpath to convert to absolute path before the loop starts.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: stuggi

.github/workflows/create-release-branch-v1.yml

@@ -315,6 +315,10 @@ jobs:
             exit 1
           fi
 
+          # Convert to absolute path since we'll be changing directories
+          REPO_LIST_FILE="$(realpath "${REPO_LIST_FILE}")"
+          echo "Using repository list file: ${REPO_LIST_FILE}"
+
           # Read repositories from YAML file
           repos=$(yq e '.repos[].name' "${REPO_LIST_FILE}" | tr '\n' ' ')