Use a string explicitly in the cross-arch job

By using a literal `true`, yaml will interpret it as a boolean.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

.github/workflows/ci.yaml

@@ -185,7 +185,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Return true
-        run: true
+        run: "true"
 
 
   build: