[ci] add install verl in ray

.github/workflows/ray_test.yml

@@ -23,6 +23,9 @@ jobs:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
             fetch-depth: 0
+      - name: Install the current repository
+        run: |
+          pip install -e .
       - name: Running some ray test that only need 2 GPUs
         run: |
           cd tests/ray