fix env

.gitea/workflows/update.yml

@@ -11,9 +11,12 @@ jobs:
       - name: Generate SSH Key
         run: |
           mkdir -p ~/.ssh/
-          echo ${{ $SSH_PRIVATE_KEY }} > private.key
+          echo "$SSH_PRIVATE_KEY" > private.key
           sudo chmod 600 private.key
-          echo ${{ SSH_KNOWN_HOSTS }} > ~/.ssh/known_hosts
+          echo "$SSH_KNOWN_HOSTS" > ~/.ssh/known_hosts
+        env:
+          SSH_PRIVATE_KEY: ${{secrets.SSH_PRIVATE_KEY}}
+          SSH_KNOWN_HOSTS: ${{secrets.SSH_KNOWN_HOSTS}}
         shell: bash
       - name: Update Compose
         run: |