ci: reduce number of build jobs on aarch64 to avoid OOM (#970)

.github/workflows/npm-publish.yml

@@ -84,6 +84,13 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+      # Buildjet aarch64 runners have only 1.5 GB RAM per core, vs 3.5 GB per core for
+      # x86_64 runners. Cargo defaults to spawn a job per core, but needs a lot
+      # of memory per job. Thus for ARM we need to reduce the number of jobs
+      # to avoid OOM errors when building.
+      - name: Configure aarch64 build
+        if: ${{ matrix.config.arch == 'aarch64' }}
+        run: echo "CARGO_BUILD_JOBS=4" >> "$GITHUB_ENV"
       - name: Build Linux Artifacts
         run: |
           bash ci/build_linux_artifacts.sh ${{ matrix.config.arch }}