continuous deployment (#2485)

* continuous deployment

* fix

* escape braces in format string

* Update upload-ota.sh

* curl fail on http error

build/registry/resync.cgi

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+declare -A params
+while IFS='=' read -r -d '&' key value && [[ -n "$key" ]]; do
+    params["$key"]=$value
+done <<<"${QUERY_STRING}&"
+
+index_key="${params['key']}"
+if [ -z "$index_key" ] || [ "$index_key" != "$(cat /var/www/index_key.txt)" ]; then
+    echo "HTTP/1.1 401 UNAUTHORIZED"
+    echo "Content-Type: text/html"
+    echo
+    echo "UNAUTHORIZED"
+    exit
+fi
+
+touch /tmp/resync
+
+echo "HTTP/1.1 200 OK"
+echo "Content-Type: text/html"
+echo
+echo "OK: Upload successful"