Merge #7206: ci: dynamically choose GitHub or blacksmith based on runner state

5bfdbd3 chore: drop unrelated typo fixes per review (Pasta Lil Claw)
d1cd212 ci: select Blacksmith runners dynamically (pasta)

Pull request description:

  ## Issue being fixed or feature implemented
  Now, only run CI on blacksmith, if GitHub CI is very congested, or if the PR has label, which will give priority CI via blacksmith.

  ## What was done?

  ## How Has This Been Tested?

  ## Breaking Changes

  ## Checklist:
    _Go over all the following points, and put an `x` in all the boxes that apply._
  - [ ] I have performed a self-review of my own code
  - [ ] I have commented my code, particularly in hard-to-understand areas
  - [ ] I have added or updated relevant unit/integration/functional/e2e tests
  - [ ] I have made corresponding changes to the documentation
  - [x] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_

ACKs for top commit:
  UdjinM6:
    utACK 5bfdbd3

Tree-SHA512: 79c0f232c34de2b6154e300ab227d14b0a6596cb502e25b09f05145721c32db13e5bb1a9ec3000dfb41fd6314bcf9cdc07b4c5c269669b9fcc8721ee5b8ab0c1

Author: PastaPastaPasta

.github/workflows/build-container.yml

@@ -15,6 +15,14 @@ on:
         description: "Container name"
         required: true
         type: string
+      runs-on-amd64:
+        description: "Runner label to use for amd64 jobs"
+        required: true
+        type: string
+      runs-on-arm64:
+        description: "Runner label to use for arm64 jobs"
+        required: true
+        type: string
     outputs:
       path:
         description: "Path to built container"
@@ -23,7 +31,7 @@ on:
 jobs:
   build-amd64:
     name: Build container (amd64)
-    runs-on: ${{ vars.RUNNER_AMD64 || 'ubuntu-24.04' }}
+    runs-on: ${{ inputs.runs-on-amd64 }}
     outputs:
       tag: ${{ steps.prepare.outputs.tag }}
       repo: ${{ steps.prepare.outputs.repo }}
@@ -69,7 +77,7 @@ jobs:
 
   build-arm64:
     name: Build container (arm64)
-    runs-on: ${{ vars.RUNNER_ARM64 || 'ubuntu-24.04-arm' }}
+    runs-on: ${{ inputs.runs-on-arm64 }}
     outputs:
       digest: ${{ steps.build.outputs.digest }}
     steps:
@@ -113,7 +121,7 @@ jobs:
 
   create-manifest:
     name: Create multi-arch manifest
-    runs-on: ${{ vars.RUNNER_ARM64 || 'ubuntu-24.04-arm' }}
+    runs-on: ${{ inputs.runs-on-arm64 }}
     needs: [build-amd64, build-arm64]
     steps:
       - name: Checkout code