New Script: Prometheus Alertmanager (#1272)

* New Script: Prometheus Alertmanager

* Alertmanager: Append v before Release-Version

* Alertmanager: Switch to `/opt` before updating release

* Alertmanager: Split `var_tags` by `;`

* Alertmanager: Change installation of curl, sudo and mc to a oneliner

Co-authored-by: Michel Roegl-Brunner <73236783+michelroegl-brunner@users.noreply.github.com>

* Alertmanager: Set correct copyright

* Alertmanager: Change the way how the systemd unit file is written to disk

Co-authored-by: Michel Roegl-Brunner <73236783+michelroegl-brunner@users.noreply.github.com>

* Alertmanager: Changed the way on how we move and delete files

* Alertmanager: Make files executable

* Alertmanager: Set correct license and source header

* Update prometheus-alertmanager.json

---------

Co-authored-by: Michel Roegl-Brunner <73236783+michelroegl-brunner@users.noreply.github.com>
Co-authored-by: CanbiZ <47820557+MickLesk@users.noreply.github.com>

json/prometheus-alertmanager.json

@@ -0,0 +1,34 @@
+{
+    "name": "Prometheus Alertmanager",
+    "slug": "prometheus-alertmanager",
+    "categories": [
+        7
+    ],
+    "date_created": "2025-01-09"
+    "type": "ct",
+    "updateable": true,
+    "privileged": false,
+    "interface_port": 9093,
+    "documentation": "https://prometheus.io/docs/alerting/latest/overview/",
+    "website": "https://prometheus.io/",
+    "logo": "https://raw.githubusercontent.com/loganmarchione/homelab-svg-assets/main/assets/prometheus.svg",
+    "description": "Alerting with Prometheus is separated into two parts. Alerting rules in Prometheus servers send alerts to an Alertmanager. The Alertmanager then manages those alerts, including silencing, inhibition, aggregation and sending out notifications via methods such as email, on-call notification systems, and chat platforms.",
+    "install_methods": [
+        {
+            "type": "default",
+            "script": "ct/prometheus-alertmanager.sh",
+            "resources": {
+                "cpu": 1,
+                "ram": 1024,
+                "hdd": 2,
+                "os": "debian",
+                "version": "12"
+            }
+        }
+    ],
+    "default_credentials": {
+        "username": null,
+        "password": null
+    },
+    "notes": []
+}