drone: x86 set correct personality

this is kind of a hack because docker is not able to properly set the
correct personality (32bit).

.drone.yml

@@ -17,7 +17,7 @@ steps:
   - name: build
     image: alpinelinux/alpine-drone-ci:edge-x86
     commands:
-      - build.sh
+      - linux32 build.sh
     environment:
       GH_TOKEN:
         from_secret: github_token