Initial commit

.workflow/get_changed_files.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+set -euo pipefail
+
+OUT_FILE="${1:-changed_files.txt}"
+touch "$OUT_FILE"
+
+# Fetch quietly; repo might be shallow in CI
+git fetch --all --quiet || true
+
+if [[ -n "${CHANGE_TARGET:-}" ]]; then
+  # Multibranch PR build: compare against target branch
+  git fetch origin "${CHANGE_TARGET}" --quiet || true
+  BASE="origin/${CHANGE_TARGET}"
+  echo "[INFO] PR build detected, diffing against ${BASE}..."
+  git diff --name-only --diff-filter=ACMRT "${BASE}...HEAD" > "$OUT_FILE" || true
+else
+  # Branch build: diff from previous successful commit (best effort), else last commit
+  if [[ -n "${GIT_PREVIOUS_SUCCESSFUL_COMMIT:-}" ]]; then
+    BASE="${GIT_PREVIOUS_SUCCESSFUL_COMMIT}"
+    echo "[INFO] Diffing against previous successful commit ${BASE}..."
+    git diff --name-only --diff-filter=ACMRT "${BASE}" "HEAD" > "$OUT_FILE" || true
+  else
+    echo "[INFO] No previous successful commit found; using last commit diff (HEAD~1..HEAD)..."
+    git diff --name-only --diff-filter=ACMRT "HEAD~1" "HEAD" > "$OUT_FILE" || true
+  fi
+fi
+
+# Clean blank lines, ensure file exists
+sed -i '/^\s*$/d' "$OUT_FILE" || true
+touch "$OUT_FILE"
+
+COUNT=$(wc -l < "$OUT_FILE" | tr -d ' ')
+echo "[INFO] Changed files: ${COUNT}"