CI: Use public ARM64 Github actions runners for ARM64 builds.

Currently, Invidious uses QEMU to build it's ARM64 Invidious image,
which is slow (since we are basically using a virtual machine).

This helps with the speed of building ARM64 binaries for Invidious
on each release/commit.

More information about the public ARM64 runners here:
https://github.com/orgs/community/discussions/148648

CI: Use ARM64 compose file for build-docker-arm64

.github/workflows/ci.yml

@@ -100,26 +100,16 @@ jobs:
 
   build-docker-arm64:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04-arm
 
     steps:
       - uses: actions/checkout@v4
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-        with:
-          platforms: arm64
+      - name: Build Docker
+        run: docker compose -f docker-compose-arm64.yml build --build-arg release=0
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Build Docker ARM64 image
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: docker/Dockerfile.arm64
-          platforms: linux/arm64/v8
-          build-args: release=0
+      - name: Run Docker
+        run: docker compose -f docker-compose-arm64.yml up -d
 
       - name: Test Docker
         run: while curl -Isf http://localhost:3000; do sleep 1; done