Upstream patches and additional patching (#2)

* Ensures DSM GUI refreshes its updates

* Removed whale icon and changed verbosity

* Added addon for Prometheus+node_exporter

* Changed local image check to check on image ID rather than name

* Update podcheck.sh

changed docker->podman, typo

* - **v0.6.0**:
    - **Grafana & Prometheus Integration:**
      - Added a detailed Prometheus metrics exporter that now reports not only the number of containers with updates, no-updates, and errors, but also the total number of containers checked, the duration of the update check, and the epoch timestamp of the last check.
      - Enhanced documentation with instructions on integrating these metrics with Grafana for visual monitoring.
    - **Improved Error Handling & Code Refactoring:**
      - Introduced `set -euo pipefail` and local variable scoping within functions to improve reliability and prevent unexpected behaviour.
      - Standardised container name handling and refined the Quadlet detection logic.
    - **Self-Update Enhancements:**
      - Updated the self-update mechanism to support both Git-based and HTTP-based updates, with an automatic restart that preserves the original arguments.
    - **Miscellaneous Improvements:**
      - Enhanced dependency installer to support both package manager and static binary installations for `jq` and `regctl`.
      - General code refactoring across the project for better readability and maintainability.

* Update podcheck.sh

* increment version

* Update Quadlet detection logic 

Update Quadlet detection logic to support flexible service naming

- Modified the quadlet update block to first try an exact match for "$i.service".
- If no exact match is found, build a regex pattern from the container name (allowing underscores and hyphens interchangeably) and search user service units.
- When multiple candidate units are found, the script attempts to choose the one that exactly matches (ignoring case) or defaults to the first candidate.
- This update allows containers like "containera" to match service units named "container_a.service" and supports scenarios with multiple counterparts (e.g., matrix-a, matrix-b, matrix_db).

* search name fix

* fixes to arg parsing

* Logic overhaul, verbose output and better syntax

* Added support for prometheus

---------

Co-authored-by: mag37 <robin.ivehult@gmail.com>

notify_templates/notify_DSM.sh

@@ -49,4 +49,7 @@ Content-Transfer-Encoding: 7bit
 $MessageBody
  From $SenderName
 __EOF
+# This ensures DSM's container manager will also see the update
+/var/packages/ContainerManager/target/tool/image_upgradable_checker
+
 }

notify_templates/notify_gotify.sh

@@ -14,7 +14,7 @@ send_notification() {
 
     # Setting the MessageTitle and MessageBody variable here.
     MessageTitle="${FromHost} - updates available."
-    printf -v MessageBody "🐋 Containers on $FromHost with updates available:\n$UpdToString"
+    printf -v MessageBody "Containers on $FromHost with updates available:\n$UpdToString"
 
     # Modify to fit your setup:
     GotifyToken="Your Gotify token here"
@@ -24,6 +24,6 @@ send_notification() {
         -F "title=${MessageTitle}" \
         -F "message=${MessageBody}" \
         -F "priority=5" \
-        -X POST "${GotifyUrl}" &> /dev/null
+        -X POST "${GotifyUrl}" 1> /dev/null
 
 }