snuyanzin commented on code in PR #29294:
URL: https://github.com/apache/flink/pull/29294#discussion_r4106456044


##########
.github/workflows/docs-legacy.yml:
##########
@@ -76,20 +76,24 @@ jobs:
             bash -c "./build_docs.sh"
 
       - name: Build documentation
+        # The build runs as root, the upload below as the runner user, hence 
the chmod
         run: |
           docker run --rm \
             --volume "$PWD:/root/flink" \
             --volume "$HOME/.m2/repository:/root/.m2/repository" \
             apache/flink-ci-docker:java_8_11_17_21_25_maven_386_3916_noble \
-            bash -c "apt-get update && apt-get install -y rsync && cd 
/root/flink && ./.github/workflows/docs.sh"
+            bash -c "apt-get update && apt-get install -y rsync && cd 
/root/flink && ./.github/workflows/docs.sh && chmod -R a+rX docs/target"
 
       - name: Upload documentation
-        uses: 
burnett01/rsync-deployments@66257cad6bfeb2171d3b6bfa6c9a22279dd9c3a1 # 8.0.5
-        with:
-          switches: --archive --compress --delete --omit-dir-times
-          path: docs/target/
-          remote_path: ${{ secrets.NIGHTLIES_RSYNC_PATH 
}}/flink/flink-docs-${{ env.flink_branch }}/
-          remote_host: ${{ secrets.NIGHTLIES_RSYNC_HOST }}
-          remote_port: ${{ secrets.NIGHTLIES_RSYNC_PORT }}
-          remote_user: ${{ secrets.NIGHTLIES_RSYNC_USER }}
-          remote_key: ${{ secrets.NIGHTLIES_RSYNC_KEY }}
+        env:
+          NIGHTLIES_RSYNC_HOST: ${{ secrets.NIGHTLIES_RSYNC_HOST }}
+          NIGHTLIES_RSYNC_KEY: ${{ secrets.NIGHTLIES_RSYNC_KEY }}
+          NIGHTLIES_RSYNC_PATH: ${{ secrets.NIGHTLIES_RSYNC_PATH }}
+          NIGHTLIES_RSYNC_PORT: ${{ secrets.NIGHTLIES_RSYNC_PORT }}
+          NIGHTLIES_RSYNC_USER: ${{ secrets.NIGHTLIES_RSYNC_USER }}
+        run: |
+          eval "$(ssh-agent -s)"

Review Comment:
   There is check that the docs server is the real one.
   By default it is `StrictHostKeyChecking=no` which means it makes SSH connect 
without verifying the server, so anyone who hijacks DNS/network can impersonate 
it. 
   
   How about adding host key something like 
   `NIGHTLIES_RSYNC_HOST_KEY: ${{ secrets.NIGHTLIES_RSYNC_HOST_KEY }}`



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