TEMP: probe the notes file read failure

.gitea/workflows/release.yml

@@ -195,8 +195,19 @@ jobs:
       - name: Collect release notes
         if: github.ref_type == 'tag'
         run: |
-          set -eu
+          set -u
           VERSION=$(grep -m1 '^version' Cargo.toml | sed 's/.*"\(.*\)".*/\1/')
+          echo "version=${VERSION}"
+
+          echo "--- probe ---"
+          ls -la "docs/releases/${VERSION}.md" 2>&1 || echo "ls FAILED"
+          echo "stat:"; stat "docs/releases/${VERSION}.md" 2>&1 | head -5 || echo "stat FAILED"
+          echo "cat relative:"; cat "docs/releases/${VERSION}.md" 2>&1 | head -2 || echo "cat FAILED"
+          echo "cat absolute:"; cat "$(pwd)/docs/releases/${VERSION}.md" 2>&1 | head -2 || echo "cat-abs FAILED"
+          echo "head:"; head -2 "docs/releases/${VERSION}.md" 2>&1 || echo "head FAILED"
+          echo "readlink:"; readlink -f "docs/releases" 2>&1 || echo "readlink FAILED"
+          echo "--- end probe ---"
+
           NOTES=$(cat "docs/releases/${VERSION}.md" 2>/dev/null || true)
           if [ -n "$NOTES" ]; then
             echo "notes: docs/releases/${VERSION}.md (${#NOTES} bytes)"