ci: split test step, publish core dumps on macos

.github/workflows/ci.yml

@@ -119,10 +119,28 @@ jobs:
       run: cargo build --locked --workspace --exclude ipfs-http --target ${{ matrix.platform.target }}
       # exclude http on other cross compilation targets because openssl
 
-    - name: Rust tests
-      if: matrix.platform.cross == false
+    - name: Rust tests (macos)
+      if: matrix.platform.cross == false && matrix.platform.host == 'macos-latest'
+      run: |
+          ulimit -c unlimited
+          sudo touch /cores/test || { ls -ld /cores; exit 1; }
+          sudo rm /cores/test
+          retval=0
+          cargo test --workspace || retval=$?
+          sudo chmod -R a+rwx /cores
+          exit $retval
+
+    - name: Rust tests (other non-cross targets)
+      if: matrix.platform.cross == false && matrix.platform.host != 'macos-latest'
       run: cargo test --workspace
 
+    - name: Upload crashes (macos)
+      uses: actions/upload-artifact@v2
+      if: matrix.platform.host == 'macos-latest' && ${{ always() }}
+      with:
+        name: macos.crashes
+        path: /cores
+
   lint-rust:
     runs-on: ubuntu-latest
     steps: