align dependency runtime baselines across Docker and CI

.github/workflows/backend-release.yml

@@ -10,16 +10,17 @@ on:
 
 env:
   IMAGE_NAME: "voyage-backend"
+  PYTHON_IMAGE: "python:3.13-slim"
 
 jobs:
   upload:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
@@ -45,6 +46,8 @@ jobs:
         with:
           context: ./backend
           platforms: linux/amd64,linux/arm64
+          build-args: |
+            PYTHON_IMAGE=${{ env.PYTHON_IMAGE }}
           push: true
           tags: |
             ghcr.io/${{ steps.repo_owner.outputs.repo_owner }}/${{ env.IMAGE_NAME }}:${{ github.event.release.tag_name }}