user ternary operator [TO SQUASH]

Author: ligurio

.github/workflows/test.yaml

@@ -37,15 +37,11 @@ jobs:
       fail-fast: false
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v4
-        if: ${{ matrix.LUA != 'tarantool' }}
-
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
           submodules: recursive
-          repository: 'tarantool/tarantool'
-        if: ${{ matrix.LUA == 'tarantool' }}
+          repository: ${{ matrix.LUA == 'tarantool' && 'tarantool/tarantool' || github.repository }} }}
 
       - name: Setup common packages
         run: |