Update get-latest-agent-version.yaml

Author: kirkone

.github/workflows/get-latest-agent-version.yaml

@@ -13,7 +13,7 @@ jobs:
           jq -r ".tag_name" | sed 's/^v\(.*\)$/\1/' > latest-agent-version
       - name: Check for modified files
         id: git-check
-        run: echo ::set-output name=modified::$(if git diff-index --quiet HEAD --; then echo "false"; else echo "true"; fi)
+        run: echo ::set-output name=modified::$([ -z "`git status --porcelain latest-agent-version`" ] && echo "false" || echo "true")
       - name: Commit latest release version
         if: steps.git-check.outputs.modified == 'true'
         run: |