Only test aarch64 on ubuntu

Author: domenukk

.github/workflows/main.yml

@@ -35,7 +35,11 @@ jobs:
           toolchain: ${{ matrix.rust }}
       # Add toolchain for no_std tests
       - run: rustup toolchain install nightly
-      - run: rustup target add aarch64-unknown-none
+      - name: Build `aarch64-unknown-none` with `no_std`
+        if: |
+          matrix.os == 'ubuntu-latest' &&
+          matrix.rust == 'nightly'
+      - run: rustup target add aarch64-unknown-none && rustup component add rust-src --toolchain nightly-x86_64-unknown-linux-gnu && cargo +nightly build -Zbuild-std=core,alloc --target aarch64-unknown-none -v --release --no-default-features --features=alloc,unstable
       - run: cargo build --all-targets
         # Run tests
       - name: Run tests
@@ -52,8 +56,6 @@ jobs:
         run: cargo test --test debugger_visualizer --features "url/serde,url/debugger_visualizer" -- --test-threads=1
       - name: Test `no_std` support
         run: cargo test --no-default-features --features=alloc,no_std_net
-      - name: Build `aarch64-unknown-none` with `no_std`
-        run: cargo +nightly build -Zbuild-std=core,alloc --target aarch64-unknown-none -v --release --no-default-features --features=alloc,unstable
 
   WASM:
     runs-on: ubuntu-latest