ci: improve workaround for rust-lang/cargo#8719

Our arm64 alpine job was taking too long, and it is likely that
the host VM was under memory pressure. Ensure the VM has enough
swap space to complete the build, and use an improved workaround
from madiele/vod2pod-rss.

.github/workflows/rust_release.yml

@@ -68,6 +68,7 @@ jobs:
       BUILD_RUST_TAG: 1.70.0
       BUILD_OS_GNU: slim-buster
       BUILD_OS_MUSL: alpine
+      CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
 
     strategy:
       matrix:
@@ -105,11 +106,10 @@ jobs:
         enableCrossOsArchive: true
         fail-on-cache-miss: true
 
-    - name: Workaround for https://github.com/rust-lang/cargo/issues/8719
-      run: |
-        sudo mkdir -p /var/lib/docker
-        sudo mount -t tmpfs -o size=10G none /var/lib/docker
-        sudo systemctl restart docker
+    - name: Set swap space
+      uses: pierotofy/set-swap-space@v1.0
+      with:
+        swap-size-gb: 10
 
     - name: Set up QEMU
       uses: docker/setup-qemu-action@v3