use native arm64 runners on nightly build

Author: willcl-ark

.github/workflows/master.yml

@@ -1,5 +1,9 @@
 name: nightly-master
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 on:
   schedule:
     - cron: "0 0 * * *"
@@ -10,20 +14,23 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
     strategy:
       matrix:
-        platform: [linux/amd64, linux/arm64]
+        platform:
+          - docker: linux/amd64
+            runner: ubuntu-24.04
+          - docker: linux/arm64
+            runner: ubuntu-24.04-arm
         variant:
           - type: ""
             suffix: ""
           - type: "-alpine"
             suffix: "/alpine"
+    runs-on: ${{ matrix.platform.runner }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
         with:
@@ -44,7 +51,7 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           context: master${{ matrix.variant.suffix }}
-          platforms: ${{ matrix.platform }}
+          platforms: ${{ matrix.platform.docker }}
           push: ${{ github.event_name == 'schedule' }}
           tags: bitcoin/bitcoin:master${{ matrix.variant.type }}
           cache-from: type=gha