.github/workflows/generate.yaml add permisssion

to fix commit errors when running in klassert/eesp-ikev2

Create a commit
  /usr/bin/git commit -m deploy: 7bef32f
  [gh-pages 80a0154] deploy: 7bef32f
   2 files changed, 23 insertions(+), 23 deletions(-)
  ::endgroup::
::group::Push the commit or tag
Push the commit or tag
  /usr/bin/git push origin gh-pages
  remote: Permission to klassert/eesp-ikev2.git denied to github-actions[bot].
  fatal: unable to access 'https://github.com/klassert/eesp-ikev2.git/': The requested URL returned error: 403
  Error: Action failed with "The process '/usr/bin/git' failed with exit code 128"
  ##[debug]Node Action run completed with exit code 1
  ##[debug]Finishing: Deploy to GitHub Pages

Author: antonyantony

.github/workflows/generate.yaml

@@ -16,6 +16,8 @@ jobs:
   build:
     name: "Update Editor's Copy"
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
 
     steps:
     - uses: actions/checkout@v4