add 32-bit tests (#440)

.github/workflows/test.yml

@@ -15,12 +15,16 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
-    - uses: actions/setup-go@v2
-      with:
-        go-version: "1.16"
-
-    - run: sudo apt update && sudo apt install -y --no-install-recommends ffmpeg
-
-    - run: make test-nodocker
+    - run: make test
 
     - run: bash <(curl -s https://codecov.io/bash)
+
+  test32:
+    name: test32
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - run: make test32