ci: use different runners

.github/actionlint.yaml

@@ -0,0 +1,6 @@
+# Configuration related to self-hosted runner.
+self-hosted-runner:
+  # Labels of self-hosted runner in array of string.
+  labels:
+    - linux-amd64
+    - linux-arm64

.github/workflows/dagster-cloud-deploy.yaml

@@ -53,19 +53,19 @@ jobs:
   build:
     needs:
       - prerun
-    runs-on: ubuntu-latest
     if: needs.prerun.outputs.result != 'skip'
     strategy:
       fail-fast: false
       matrix:
-        platform:
-          - linux/amd64
-          - linux/arm64
+        runner:
+          - linux-amd64
+          - linux-arm64
+    runs-on: ${{ matrix.runner }}
     steps:
       - name: Prepare
         run: |
-          platform=${{ matrix.platform }}
-          echo "PLATFORM_PAIR=${platform//\//-}" >> "${GITHUB_ENV}"
+          runner=${{ matrix.runner }}
+          echo "PLATFORM_PAIR=${runner//-//}" >> "${GITHUB_ENV}"
 
       # https://github.com/actions/checkout
       - uses: actions/checkout@v4
@@ -106,9 +106,9 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           context: .
-          cache-from: type=gha,scope=build-${{ env.PLATFORM_PAIR }}
-          cache-to: type=gha,mode=max,scope=build-${{ env.PLATFORM_PAIR }}
-          platforms: ${{ matrix.platform }}
+          cache-from: type=gha,scope=build-${{ matrix.runner }}
+          cache-to: type=gha,mode=max,scope=build-${{ matrix.runner }}
+          platforms: ${{ env.PLATFORM_PAIR }}
           labels: ${{ steps.meta.outputs.labels }}
           build-args: |
             PYTHON_VERSION=${{ inputs.python-version }}
@@ -127,7 +127,7 @@ jobs:
       - name: Upload digest
         uses: actions/upload-artifact@v4
         with:
-          name: digests-${{ env.PLATFORM_PAIR }}
+          name: digests-${{ matrix.runner }}
           path: /tmp/digests/*
           if-no-files-found: error
           retention-days: 1