add deploy script for homepage

docs/deploy-docs.nix

@@ -0,0 +1,35 @@
+{
+  writeShellScriptBin,
+  coreutils,
+  openssh,
+  rsync,
+  lib,
+  docs,
+}:
+
+writeShellScriptBin "deploy-docs" ''
+  export PATH="${
+    lib.makeBinPath [
+      coreutils
+      openssh
+      rsync
+    ]
+  }"
+
+  if [ -n "$SSH_HOMEPAGE_KEY" ]; then
+    echo "$SSH_HOMEPAGE_KEY" > ./ssh_key
+    chmod 600 ./ssh_key
+    sshExtraArgs="-i ./ssh_key"
+  else
+    sshExtraArgs=
+  fi
+
+  rsync \
+    -e "ssh -o StrictHostKeyChecking=no $sshExtraArgs" \
+    -a ${docs}/ \
+    www@clan.lol:/var/www/docs.clan.lol
+
+  if [ -e ./ssh_key ]; then
+    rm ./ssh_key
+  fi
+''