fix: output for gofmt

This was outputting a single error line even when multiple files needed formatting.

Author: alanshaw

.github/workflows/go-check.yml

@@ -141,7 +141,7 @@ jobs:
         run: |
           out=$(gofmt -s -l .)
           if [[ -n "$out" ]]; then
-            echo $out | awk '{print "::error file=" $0 ",line=0,col=0::File is not gofmt-ed."}'
+            echo $out | tr " " "\n" | awk '{print "::error file=" $0 ",line=0,col=0::File " $0 " is not gofmt-ed."}'
             exit 1
           fi
       - name: go vet