feat(CI/CD): stub workflow for CPU-based vLLM image generation (#138)

Create a stub workflow to test PR #129.


Approved-by: rhdedgar

Author: courtneypacheco

.github/workflows/build-vllm-cpu-image.yml

@@ -0,0 +1,11 @@
+
+name: Build CPU-only vLLM Image
+
+on:
+  workflow_dispatch:
+
+jobs:
+  placeholder:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "This is a placeholder job to make the workflow discoverable by the GitHub API."