Add git pull --rebase before pushing changes

Add git pull --rebase before pushing changes to ensure the branch is up to date.

Author: sirdarckcat

.github/workflows/update-images.yaml

@@ -337,7 +337,6 @@ jobs:
         SUBMITTER: ${{ github.event.head_commit.author.email }}
       run: |
         # git add returns success for files that exist and haven't been modified
-        git pull --rebase
         git add kctf-operator/resources/constants.go
         git add dist/resources/install.yaml
         git add kctf-operator/config/crd/bases/kctf.dev_challenges.yaml
@@ -353,5 +352,6 @@ jobs:
         git config user.email "$SUBMITTER"
         git config user.name "GitHub Action"
         if git commit -m "Automated commit: update images."; then
+          git pull --rebase
           git push
         fi