CI: Test on 32-bit arm

Author: dveeden

.github/workflows/ci.yml

@@ -108,7 +108,7 @@ jobs:
   platforms:
     strategy:
       matrix:
-        arch: [ "amd64", "arm64" ]
+        arch: [ "amd64", "arm64", "arm" ]
         os: [ "linux", "freebsd", "darwin" ]
     name: platforms
     runs-on: ubuntu-latest