Add debug output for deploy key

.woodpecker.yml

@@ -30,6 +30,16 @@ steps:
       - cd apps/admin && pnpm build
     depends_on: [install]
 
+  debug-secret:
+    image: alpine:3.21
+    secrets: [staging_deploy_key]
+    commands:
+      - echo "SECRET_LENGTH=$(echo -n \"$STAGING_DEPLOY_KEY\" | wc -c)"
+      - echo "$STAGING_DEPLOY_KEY" | base64 -d > /tmp/key_test
+      - wc -l /tmp/key_test
+      - head -1 /tmp/key_test
+    depends_on: [build-backend]
+
   deploy-backend:
     image: alpine:3.21
     secrets: [staging_deploy_key]
@@ -38,6 +48,7 @@ steps:
       - mkdir -p ~/.ssh
       - echo "$STAGING_DEPLOY_KEY" | base64 -d > ~/.ssh/id_ed25519
       - chmod 600 ~/.ssh/id_ed25519
+      - ssh-keygen -y -f ~/.ssh/id_ed25519
       - ssh-keyscan -H staging.rebreak.org > ~/.ssh/known_hosts 2>/dev/null
       - tar czf backend-output.tar.gz -C backend/.output .
       - scp -i ~/.ssh/id_ed25519 backend-output.tar.gz root@staging.rebreak.org:/srv/rebreak/backend/.output-incoming.tar.gz