use arm CI runners instead of QEMU (#523)

These are much faster.

Author: bgentry

.github/workflows/docker-riverproui.yaml

@@ -34,18 +34,20 @@ env:
 
 jobs:
   build-riverproui:
-    name: "Build image: riverproui"
-    runs-on: ubuntu-latest
+    name: "Build image: riverproui (${{ matrix.docker_platform }})"
+    runs-on: ${{ matrix.runner }}
     # Skip this job when manually dispatched with verify_only=true
     if: ${{ !(github.event_name == 'workflow_dispatch' && inputs.verify_only) }}
     env:
       ECR_ACCOUNT_ID: ${{ secrets.ECR_CACHE_AWS_ACCOUNT_ID }}
       ECR_ROLE_ARN: ${{ secrets.ECR_CACHE_ROLE_ARN }}
     strategy:
       matrix:
-        docker_platform:
-          - linux/amd64
-          - linux/arm64
+        include:
+          - docker_platform: linux/amd64
+            runner: ubuntu-24.04
+          - docker_platform: linux/arm64
+            runner: ubuntu-24.04-arm
     permissions:
       contents: read
       id-token: write
@@ -71,9 +73,6 @@ jobs:
           platform=${{ matrix.docker_platform }}
           echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 

.github/workflows/docker-riverui.yaml

@@ -17,16 +17,18 @@ on:
 
 jobs:
   build-riverui:
-    name: "Build image: riverui"
-    runs-on: ubuntu-latest
+    name: "Build image: riverui (${{ matrix.docker_platform }})"
+    runs-on: ${{ matrix.runner }}
     env:
       IMAGE_NAME: ${{ github.repository }}
       REGISTRY: ghcr.io
     strategy:
       matrix:
-        docker_platform:
-          - linux/amd64
-          - linux/arm64
+        include:
+          - docker_platform: linux/amd64
+            runner: ubuntu-24.04
+          - docker_platform: linux/arm64
+            runner: ubuntu-24.04-arm
     outputs:
       tags: ${{ steps.meta.outputs.tags }}
       labels: ${{ steps.meta.outputs.labels }}
@@ -47,9 +49,6 @@ jobs:
           platform=${{ matrix.docker_platform }}
           echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3