only run gendocs workflow if there are changes

.github/workflows/docs.yml

@@ -15,10 +15,13 @@ jobs:
         with:
           go-version: ${{env.GO_VERSION}}
           stable: true
-      - name: gendocs
+      - name: Generate Docs
+        id: gendocs
         run: |
           make generate-docs
+          echo "::set-output name=changes::$(git status --porcelain)"
       - name: Create PR
+        if: ${{ step.gendocs.outputs.changes != '' }}
         uses: peter-evans/create-pull-request@v3
         with:
           token: ${{ secrets.MINIKUBE_BOT_PAT }}
@@ -30,4 +33,4 @@ jobs:
           base: master
           delete-branch: true
           title: 'Update auto-generated docs and translations'
-          body: 'Committing changes resulting from `make generate-docs`'
+          body: 'Committing changes resulting from `make generate-docs`\n\nAutogenerated by the generate-docs github action workflow.\n\n${{ step.gendocs.outputs.changes }}'