[ci] feat: migrate gpu_unit_tests to volcengine (verl-project#3872)

### What does this PR do?

- As title

### Checklist Before Starting

- [ ] Search for similar PRs. Paste at least one query link here: ...
- [ ] Format the PR title as `[{modules}] {type}: {description}` (This
will be checked by the CI)
- `{modules}` include `fsdp`, `megatron`, `sglang`, `vllm`, `rollout`,
`trainer`, `ci`, `training_utils`, `recipe`, `hardware`, `deployment`,
`ray`, `worker`, `single_controller`, `misc`, `perf`, `model`, `algo`,
`env`, `tool`, `ckpt`, `doc`, `data`
- If this PR involves multiple modules, separate them with `,` like
`[megatron, fsdp, doc]`
  - `{type}` is in `feat`, `fix`, `refactor`, `chore`, `test`
- If this PR breaks any API (CLI arguments, config, function signature,
etc.), add `[BREAKING]` to the beginning of the title.
  - Example: `[BREAKING][fsdp, megatron] feat: dynamic batching`

### Test

> For changes that can not be tested by CI (e.g., algorithm
implementation, new model support), validate by experiment(s) and show
results like training curve plots, evaluation results, etc.

### API and Usage Example

> Demonstrate how the API changes if any, and provide usage example(s)
if possible.

```python
# Add code snippet or script demonstrating how to use this
```

### Design & Code Changes

> Demonstrate the high-level design if this PR is complex, and list the
specific changes.

### Checklist Before Submitting

> [!IMPORTANT]
> Please check all the following items before requesting a review,
otherwise the reviewer might deprioritize this PR for review.

- [ ] Read the [Contribute
Guide](https://github.com/volcengine/verl/blob/main/CONTRIBUTING.md).
- [ ] Apply [pre-commit
checks](https://github.com/volcengine/verl/blob/main/CONTRIBUTING.md#code-linting-and-formatting):
`pre-commit install && pre-commit run --all-files --show-diff-on-failure
--color=always`
- [ ] Add / Update [the
documentation](https://github.com/volcengine/verl/tree/main/docs).
- [ ] Add unit or end-to-end test(s) to [the CI
workflow](https://github.com/volcengine/verl/tree/main/.github/workflows)
to cover all the code. If not feasible, explain why: ...
- [ ] Once your PR is ready for CI, send a message in [the `ci-request`
channel](https://verl-project.slack.com/archives/C091TCESWB1) in [the
`verl` Slack
workspace](https://join.slack.com/t/verl-project/shared_invite/zt-3855yhg8g-CTkqXu~hKojPCmo7k_yXTQ).
(If not accessible, please try [the Feishu group
(飞书群)](https://applink.larkoffice.com/client/chat/chatter/add_by_link?link_token=772jd4f1-cd91-441e-a820-498c6614126a).)

Author: vermouth1992

.github/workflows/gpu_unit_tests.yml

@@ -70,19 +70,36 @@ concurrency:
 permissions: 
   contents: read
 
+env:
+  IMAGE: "verl-ci-cn-beijing.cr.volces.com/verlai/verl:app-verl0.6-transformers4.56.1-sglang0.5.2-mcore0.13.0-te2.2"
+  DYNAMIC_RUNNER_ENDPOINT: "https://sd10g3clalm04ug7alq90.apigateway-cn-beijing.volceapi.com/runner"
+
 jobs:
+  setup:
+    if: github.repository_owner == 'volcengine'
+    runs-on: ubuntu-latest
+    outputs:
+      runner-label: ${{ steps.create-runner.outputs.runner-label }}
+      mlp-task-id: ${{ steps.create-runner.outputs.mlp-task-id }}
+    steps:
+      - uses: actions/checkout@v4
+      - id: create-runner
+        uses: volcengine/vemlp-github-runner@v1
+        with:
+          mode: "create"
+          faas-url: "${{ env.DYNAMIC_RUNNER_ENDPOINT }}"
+          mlp-image: "${{ env.IMAGE }}"
+
   gpu_unit_tests:
     if: github.repository_owner == 'volcengine'
-    runs-on: [L20x8]
+    needs: setup
+    runs-on: [ "${{ needs.setup.outputs.runner-label || 'L20x8' }}" ]
     timeout-minutes: 60 # Increase this timeout value as needed
     env:
       HTTP_PROXY: ${{ secrets.PROXY_HTTP }}
       HTTPS_PROXY: ${{ secrets.PROXY_HTTPS }}
       NO_PROXY: "localhost,127.0.0.1"
       HF_HUB_ENABLE_HF_TRANSFER: 1
-    container:
-      image: verlai/verl:app-verl0.6-transformers4.56.1-sglang0.5.2-mcore0.13.0-te2.2
-      options: --gpus all --shm-size=10g
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
@@ -94,11 +111,11 @@ jobs:
           pip3 install --upgrade "ray>=2.40.0"
           pip3 install cupy-cuda12x
           pip3 install mlflow
-      - name: Download Model to Use
-        run: |
-          huggingface-cli download Qwen/Qwen2.5-0.5B-Instruct
-          huggingface-cli download Qwen/Qwen2.5-1.5B-Instruct
-          export HF_HUB_OFFLINE=1
+#      - name: Download Model to Use
+#        run: |
+#          huggingface-cli download Qwen/Qwen2.5-0.5B-Instruct
+#          huggingface-cli download Qwen/Qwen2.5-1.5B-Instruct
+#          export HF_HUB_OFFLINE=1
         # Disable requests to avoid network errors
       - name: Run all GPU unit tests
         run: |
@@ -112,3 +129,19 @@ jobs:
       - name: Testing FSDP2 critic functionality
         run: |
           torchrun --standalone --nnodes=1 --nproc-per-node=2 tests/workers/critic/test_special_dp_critic.py
+
+  cleanup:
+    runs-on: ubuntu-latest
+    needs:
+      [
+        setup,
+        gpu_unit_tests,
+      ]
+    if: always()
+    steps:
+      - id: destroy-runner
+        uses: volcengine/vemlp-github-runner@v1
+        with:
+          mode: "destroy"
+          faas-url: "${{ env.DYNAMIC_RUNNER_ENDPOINT }}"
+          mlp-task-id: "${{ needs.setup.outputs.mlp-task-id }}"