ci: add architecture labels to self-hosted runner configuration

- Add arm64 label to ARM64 self-hosted runner job
- Add x64 label to x86_64 self-hosted runner jobs (both container and non-container)
- Ensures runner selection by both custom runner name and architecture type

.github/workflows/_build_linux_arm_self_host.yml

@@ -42,7 +42,9 @@ on:
 jobs:
   build_wheels_self_hosted:
     name: Build wheels and Upload (Linux x86_64, self-hosted runner)
-    runs-on: ${{ inputs.runner }}
+    runs-on:
+      - ${{ inputs.runner }}
+      - arm64
     container:
       image: ${{ inputs.container-image }}
       options: --platform linux/arm64

.github/workflows/_build_linux_self_host.yml

@@ -48,7 +48,9 @@ jobs:
   build_wheels_self_hosted:
     if: ${{ inputs.use-container }}
     name: Build wheels and Upload (Linux x86_64, self-hosted runner)
-    runs-on: ${{ inputs.runner }}
+    runs-on:
+      - ${{ inputs.runner }}
+      - x64
     container:
       image: ${{ inputs.container-image }}
     defaults:
@@ -185,7 +187,9 @@ jobs:
   build_wheels_self_hosted_no_container:
     if: ${{ !inputs.use-container }}
     name: Build wheels and Upload (Linux x86_64, self-hosted runner)
-    runs-on: ${{ inputs.runner }}
+    runs-on:
+      - ${{ inputs.runner }}
+      - x64
     defaults:
       run:
         shell: bash