ci(image): wire singleton merges + -- artifact separator

Closes the same singletons gap on the LocalAI server image workflow that
PR #9781 closed for backends. The user observed it as missing
:latest-gpu-nvidia-cuda-12 etc. on quay.io/go-skynet/local-ai — the
build matrix has six single-arch entries with no corresponding merge
step, so their per-arch digests push (push-by-digest=true) and never
get tagged:

  - -gpu-hipblas              (hipblas-jobs)
  - -gpu-nvidia-cuda-12       (core-image-build)
  - -gpu-nvidia-cuda-13       (core-image-build)
  - -gpu-intel                (core-image-build)
  - -nvidia-l4t-arm64         (gh-runner)
  - -nvidia-l4t-arm64-cuda-13 (gh-runner)

Only :latest, :v<X>, :latest-gpu-vulkan and :v<X>-gpu-vulkan were
actually being published before this commit (the two multiarch suffixes
that had merge jobs).

Changes:

1. image.yml: add six new merge jobs, one per single-arch entry. Each
   `needs:` only its parent build job (matching the existing pattern
   for core-image-merge / gpu-vulkan-image-merge).
2. image_build.yml: switch artifact name to
   `digests-localai<suffix>--<platform-tag-or-"single">`. The `--`
   separator anchors the merge-side glob so a singleton tag-suffix
   doesn't over-match a longer suffix that shares its prefix
   (-nvidia-l4t-arm64 vs -nvidia-l4t-arm64-cuda-13). Same convention
   as backend_build.yml's fix.
3. image_merge.yml: update the download pattern to match.

Next master push or tag release should produce :latest-gpu-hipblas,
:latest-gpu-nvidia-cuda-12, :latest-gpu-nvidia-cuda-13, :latest-gpu-intel,
:latest-nvidia-l4t-arm64, :latest-nvidia-l4t-arm64-cuda-13 (and their
:v<X>-* equivalents) for the first time on the post-#9781 workflow.

Assisted-by: Claude:claude-opus-4-7
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

.github/workflows/image.yml

@@ -175,7 +175,91 @@
         dockerPassword: ${{ secrets.DOCKERHUB_PASSWORD }}
         quayUsername: ${{ secrets.LOCALAI_REGISTRY_USERNAME }}
         quayPassword: ${{ secrets.LOCALAI_REGISTRY_PASSWORD }}
-  
+
+    # Single-arch server-image merges. Same conceptual fix as the backend
+    # singletons in PR #9781: image_build.yml pushes by canonical digest
+    # only, so without a downstream merge step there's no tag for consumers
+    # (no :latest-gpu-nvidia-cuda-12, no :v<X>-gpu-nvidia-cuda-12, etc.).
+    # Each merge job needs only its parent build matrix and is filtered by
+    # tag-suffix in image_merge.yml's artifact-download pattern.
+    gpu-nvidia-cuda-12-image-merge:
+      if: github.repository == 'mudler/LocalAI'
+      needs: core-image-build
+      uses: ./.github/workflows/image_merge.yml
+      with:
+        tag-latest: 'auto'
+        tag-suffix: '-gpu-nvidia-cuda-12'
+      secrets:
+        dockerUsername: ${{ secrets.DOCKERHUB_USERNAME }}
+        dockerPassword: ${{ secrets.DOCKERHUB_PASSWORD }}
+        quayUsername: ${{ secrets.LOCALAI_REGISTRY_USERNAME }}
+        quayPassword: ${{ secrets.LOCALAI_REGISTRY_PASSWORD }}
+
+    gpu-nvidia-cuda-13-image-merge:
+      if: github.repository == 'mudler/LocalAI'
+      needs: core-image-build
+      uses: ./.github/workflows/image_merge.yml
+      with:
+        tag-latest: 'auto'
+        tag-suffix: '-gpu-nvidia-cuda-13'
+      secrets:
+        dockerUsername: ${{ secrets.DOCKERHUB_USERNAME }}
+        dockerPassword: ${{ secrets.DOCKERHUB_PASSWORD }}
+        quayUsername: ${{ secrets.LOCALAI_REGISTRY_USERNAME }}
+        quayPassword: ${{ secrets.LOCALAI_REGISTRY_PASSWORD }}
+
+    gpu-intel-image-merge:
+      if: github.repository == 'mudler/LocalAI'
+      needs: core-image-build
+      uses: ./.github/workflows/image_merge.yml
+      with:
+        tag-latest: 'auto'
+        tag-suffix: '-gpu-intel'
+      secrets:
+        dockerUsername: ${{ secrets.DOCKERHUB_USERNAME }}
+        dockerPassword: ${{ secrets.DOCKERHUB_PASSWORD }}
+        quayUsername: ${{ secrets.LOCALAI_REGISTRY_USERNAME }}
+        quayPassword: ${{ secrets.LOCALAI_REGISTRY_PASSWORD }}
+
+    gpu-hipblas-image-merge:
+      if: github.repository == 'mudler/LocalAI'
+      needs: hipblas-jobs
+      uses: ./.github/workflows/image_merge.yml
+      with:
+        tag-latest: 'auto'
+        tag-suffix: '-gpu-hipblas'
+      secrets:
+        dockerUsername: ${{ secrets.DOCKERHUB_USERNAME }}
+        dockerPassword: ${{ secrets.DOCKERHUB_PASSWORD }}
+        quayUsername: ${{ secrets.LOCALAI_REGISTRY_USERNAME }}
+        quayPassword: ${{ secrets.LOCALAI_REGISTRY_PASSWORD }}
+
+    nvidia-l4t-arm64-image-merge:
+      if: github.repository == 'mudler/LocalAI'
+      needs: gh-runner
+      uses: ./.github/workflows/image_merge.yml
+      with:
+        tag-latest: 'auto'
+        tag-suffix: '-nvidia-l4t-arm64'
+      secrets:
+        dockerUsername: ${{ secrets.DOCKERHUB_USERNAME }}
+        dockerPassword: ${{ secrets.DOCKERHUB_PASSWORD }}
+        quayUsername: ${{ secrets.LOCALAI_REGISTRY_USERNAME }}
+        quayPassword: ${{ secrets.LOCALAI_REGISTRY_PASSWORD }}
+
+    nvidia-l4t-arm64-cuda-13-image-merge:
+      if: github.repository == 'mudler/LocalAI'
+      needs: gh-runner
+      uses: ./.github/workflows/image_merge.yml
+      with:
+        tag-latest: 'auto'
+        tag-suffix: '-nvidia-l4t-arm64-cuda-13'
+      secrets:
+        dockerUsername: ${{ secrets.DOCKERHUB_USERNAME }}
+        dockerPassword: ${{ secrets.DOCKERHUB_PASSWORD }}
+        quayUsername: ${{ secrets.LOCALAI_REGISTRY_USERNAME }}
+        quayPassword: ${{ secrets.LOCALAI_REGISTRY_PASSWORD }}
+
     gh-runner:
       if: github.repository == 'mudler/LocalAI'
       uses: ./.github/workflows/image_build.yml

.github/workflows/image_build.yml

@@ -202,7 +202,11 @@ jobs:
         if: github.event_name != 'pull_request'
         uses: actions/upload-artifact@v7
         with:
-          name: digests-localai${{ inputs.tag-suffix == '' && '-core' || inputs.tag-suffix }}-${{ inputs.platform-tag }}
+          # `--` separator + 'single' placeholder for empty platform-tag —
+          # same pattern as backend_build.yml. Prevents prefix collisions
+          # in the merge-side glob (e.g. -nvidia-l4t-arm64 is a prefix of
+          # -nvidia-l4t-arm64-cuda-13).
+          name: digests-localai${{ inputs.tag-suffix == '' && '-core' || inputs.tag-suffix }}--${{ inputs.platform-tag || 'single' }}
           path: /tmp/digests/*
           if-no-files-found: error
           retention-days: 1

.github/workflows/image_merge.yml

@@ -45,7 +45,10 @@ jobs:
       - name: Download digests
         uses: actions/download-artifact@v8
         with:
-          pattern: digests-localai${{ inputs.tag-suffix == '' && '-core' || inputs.tag-suffix }}-*
+          # `--` separator anchors the glob so we don't over-match sibling
+          # tag-suffixes (e.g. -nvidia-l4t-arm64 vs -nvidia-l4t-arm64-cuda-13).
+          # Must stay in sync with image_build.yml's upload-artifact name.
+          pattern: digests-localai${{ inputs.tag-suffix == '' && '-core' || inputs.tag-suffix }}--*
           merge-multiple: true
           path: /tmp/digests