fix(ci): make check-migrations-pair.sh POSIX sh compatible

Убрана bash process substitution; скрипт работает под sh в Gitea runner (DEP-03).

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/check-migrations-pair.sh

@@ -11,21 +11,54 @@ list_nums() {
   ls "$dir" 2>/dev/null | sed -n 's/^\([0-9]\{6\}\)_.*\.up\.sql$/\1/p' | sort -u
 }
 
+migration_only_in() {
+  # Prints numbers present in $1 but not in $2 (space-separated lists).
+  haystack="$2 "
+  for n in $1; do
+    case "$haystack" in
+      *" $n "*) ;;
+      *) echo "$n" ;;
+    esac
+  done
+}
+
 pg_nums="$(list_nums "$PG")"
 sql_nums="$(list_nums "$SQL")"
 
 if [ "$pg_nums" != "$sql_nums" ]; then
   echo "check-migrations-pair: postgres and sqlite migration numbers differ" >&2
-  echo "postgres only:" >&2
-  comm -23 <(printf '%s\n' "$pg_nums") <(printf '%s\n' "$sql_nums") >&2 || true
-  echo "sqlite only:" >&2
-  comm -13 <(printf '%s\n' "$pg_nums") <(printf '%s\n' "$sql_nums") >&2 || true
+  only_pg="$(migration_only_in "$pg_nums" "$sql_nums")"
+  only_sql="$(migration_only_in "$sql_nums" "$pg_nums")"
+  if [ -n "$only_pg" ]; then
+    echo "postgres only:" >&2
+    for n in $only_pg; do
+      echo "  $n" >&2
+    done
+  fi
+  if [ -n "$only_sql" ]; then
+    echo "sqlite only:" >&2
+    for n in $only_sql; do
+      echo "  $n" >&2
+    done
+  fi
   exit 1
 fi
 
 for n in $pg_nums; do
-  pg_up="$(ls "$PG"/${n}_*.up.sql 2>/dev/null | head -1)"
-  sql_up="$(ls "$SQL"/${n}_*.up.sql 2>/dev/null | head -1)"
+  pg_up=""
+  sql_up=""
+  for f in "$PG"/${n}_*.up.sql; do
+    if [ -f "$f" ]; then
+      pg_up="$f"
+      break
+    fi
+  done
+  for f in "$SQL"/${n}_*.up.sql; do
+    if [ -f "$f" ]; then
+      sql_up="$f"
+      break
+    fi
+  done
   if [ -z "$pg_up" ] || [ -z "$sql_up" ]; then
     echo "check-migrations-pair: missing .up.sql for $n" >&2
     exit 1