Fixup PR check to name kit CLI binary correctly after build

By default, go build is outputting a file named kitops, which is
untracked in the repository. This breaks later PR checks that check for
autogenerated files, etc. since it makes the repository state dirty.

.github/workflows/pr.yaml

@@ -35,7 +35,7 @@ jobs:
 
       - name: Check build
         run: |
-          if ! go build; then
+          if ! go build -o kit; then
             echo "Project does not build"
             exit 1
           fi