push docs to delta.chat instead of codespeak

.github/workflows/upload-docs.yml

@@ -76,8 +76,10 @@ jobs:
       - name: Build C documentation
         run: nix build .#jsonrpc-docs
       - name: Upload to ts.delta.chat
-        run: |
-          mkdir -p "$HOME/.ssh"
-          echo "${{ secrets.CODESPEAK_KEY }}" > "$HOME/.ssh/key"
-          chmod 600 "$HOME/.ssh/key"
-          rsync -avzh -e "ssh -i $HOME/.ssh/key -o StrictHostKeyChecking=no" $GITHUB_WORKSPACE/result/html/ "delta@c.delta.chat:/home/delta/build-ts/master"
+        uses: up9cloud/action-rsync@v1.3
+        env:
+          USER: ${{ secrets.USERNAME }}
+          KEY: ${{ secrets.KEY }}
+          HOST: "delta.chat"
+          SOURCE: "target/doc"
+          TARGET: "/var/www/html/ts/"