Fix unsafe injection pattern

Author: mcornella

.github/workflows/publish.yml

@@ -23,11 +23,13 @@ jobs:
       - name: Set up .wiki remote
         run: git remote add dot-wiki [email protected]:ohmyzsh/ohmyzsh.wiki.git
       - name: Set up deploy keys to push to remote
+        env:
+          WIKI_DEPLOY_PRIVATE_KEY: ${{ secrets.WIKI_DEPLOY_PRIVATE_KEY }}
         run: |
           # Write deploy key to ~/.ssh/id_ed25519. Git will automatically
           # use ~/.ssh/id_ed25519 to log in to github.com (see `man ssh`)
           mkdir -p ~/.ssh
-          echo "${{ secrets.WIKI_DEPLOY_PRIVATE_KEY }}" > ~/.ssh/id_ed25519
+          echo "${WIKI_DEPLOY_PRIVATE_KEY}" > ~/.ssh/id_ed25519
           chmod 600 ~/.ssh/id_ed25519
       - name: Push commits to main wiki remote
         run: git push --force dot-wiki HEAD:master