Remove temporary files after uploading website

Signed-off-by: Egor Savkin <es@m-labs.hk>

nixbld-etc-nixos/configuration.nix

@@ -642,7 +642,19 @@ in
     notificationSender = "hydra@m-labs.hk";
     minimumDiskFree = 15;  # in GB
     minimumDiskFreeEvaluator = 1;
-    extraConfig =
+    extraConfig = let
+      deployWebIntl = pkgs.writeShellScript "deployWebIntl"
+        ''
+        #!${pkgs.bash}/bin/bash
+        [ $(jq '.buildStatus' < $HYDRA_JSON) = 0 ]
+        export "TMPSSH=`mktemp -d`"
+        trap "rm -rf '$TMPSSH'" EXIT
+        cp --preserve=mode /opt/hydra_id_ed25519 "$TMPSSH/id_ed25519"
+        cp --preserve=mode /opt/hydra_id_ed25519.pub "$TMPSSH/id_ed25519.pub"
+        echo "5.78.86.156 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEMbV69aqkHdQ1T5lMuALyHjNowU1rottZtEV4OhKQ6Y" > "$TMPSSH/known_hosts"
+        ${pkgs.rsync}/bin/rsync -r -e "${pkgs.openssh}/bin/ssh -i '$TMPSSH/id_ed25519' -o 'UserKnownHostsFile=$TMPSSH/known_hosts' -o IdentitiesOnly=yes" -c $(jq -r '.outputs[0].path' < $HYDRA_JSON)/ zolaupd@5.78.86.156:/var/www/m-labs-intl.com/html/
+        '';
+      in
       ''
       binary_cache_secret_key_file = /etc/nixos/secret/nixbld.m-labs.hk-1
       max_output_size = 10000000000
@@ -653,13 +665,7 @@ in
       </runcommand>
       <runcommand>
         job = web:web:web-intl
-        command = [ $(jq '.buildStatus' < $HYDRA_JSON) = 0 ] && export HOME=`mktemp -d` && \
+        command = ${deployWebIntl}
-          mkdir $HOME/.ssh && \
-          cp /opt/hydra_id_ed25519 $HOME/.ssh/id_ed25519 && \
-          cp /opt/hydra_id_ed25519.pub $HOME/.ssh/id_ed25519.pub && \
-          echo "5.78.86.156 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEMbV69aqkHdQ1T5lMuALyHjNowU1rottZtEV4OhKQ6Y" > $HOME/.ssh/known_hosts && \
-          chmod 600 $HOME/.ssh/id_ed25519 && \
-          ${pkgs.rsync}/bin/rsync -r -c $(jq -r '.outputs[0].path' < $HYDRA_JSON) zolaupd@5.78.86.156:/var/www/m-labs-intl.com/html/
       </runcommand>
       <runcommand>
         job = web:web:nmigen-docs