ci: add 32-bit test

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

Diff for: .github/workflows/validate.yml

@@ -88,3 +88,7 @@ jobs:
 
       - name: test
         run: make TESTFLAGS="${{ matrix.race }}" test
+
+      - name: test 32-bit
+        if: ${{ matrix.race }} == "" # -race is not supported on linux/386
+        run: make GOARCH=386 test