ci: add i386 unit test run

[v2: enable cgo]

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

.github/workflows/test.yml

@@ -70,6 +70,16 @@ jobs:
       if: matrix.rootless != 'rootless'
       run: sudo -E PATH="$PATH" -- make localunittest
 
+    # We need to continue support for 32-bit ARM.
+    # However, we do not have 32-bit ARM CI, so we use i386 for testing 32bit stuff.
+    # We are not interested in providing official support for i386.
+    - name: unit test (i386)
+      if: matrix.rootless != 'rootless'
+      run: |
+        sudo apt -q install libseccomp-dev:i386
+        # cgo is disabled by default when cross-compiling
+        sudo -E PATH="$PATH" -- make GOARCH=386 CGO_ENABLED=1 localunittest
+
     - name: add rootless user
       if: matrix.rootless == 'rootless'
       run: |