permission checks, dsm readme, markdown (#171)

* added check for docker socket permissions

* added sudo-check to pkg-manager

* corrected variable typo and some printf colors

* and newline..

* DSM extra readme added

* final tweaks, DSM readme

* added markdown to readme

* added markdown support to telegram template

* removed container specification from compose up -d
This will ensure any dependant containers in the same stack will
restart, others will be untouched.

* Rearranged where the url enrichment happens

notify_templates/notify_telegram.sh

@@ -1,5 +1,5 @@
 ### DISCLAIMER: This is a third party addition to dockcheck - best effort testing.
-NOTIFY_TELEGRAM_VERSION="v0.1"
+NOTIFY_TELEGRAM_VERSION="v0.2"
 #
 # Copy/rename this file to notify.sh to enable the notification snippet.
 # Required receiving services must already be set up.
@@ -8,12 +8,19 @@ NOTIFY_TELEGRAM_VERSION="v0.1"
 FromHost=$(hostname)
 
 trigger_notification() {
+
+    if [[ "$PrintMarkdownURL" == true ]]; then
+        ParseMode="Markdown"
+    else
+        ParseMode="HTML"
+    fi
+
     # Modify to fit your setup:
     TelegramToken="Your Telegram token here"
     TelegramChatId="Your Telegram ChatId here"
     TelegramUrl="https://api.telegram.org/bot$TelegramToken"
     TelegramTopicID=12345678 ## Set to 0 if not using specific topic within chat
-    TelegramData="{\"chat_id\":\"$TelegramChatId\",\"text\":\"$MessageBody\",\"message_thread_id\":\"$TelegramTopicID\",\"disable_notification\": false}"
+    TelegramData="{\"chat_id\":\"$TelegramChatId\",\"text\":\"$MessageBody\",\"message_thread_id\":\"$TelegramTopicID\",\"disable_notification\": false,\"parse_mode\": \"$ParseMode\",\"disable_web_page_preview\": true}"
 
     curl -sS -o /dev/null --fail -X POST "$TelegramUrl/sendMessage" -H 'Content-Type: application/json' -d "$TelegramData"
 }