[#361] Integrate Loki panel for deployment log visualization in Grafana

- Added a new panel to the GovTool Grafana dashboard configuration for
  visualizing deployment logs.
- This panel uses the Loki data source to display logs from
  `/var/log/deployment.log`, providing a trace of every deployment made.
- The panel is configured to display logs in descending order, focusing
  on deployment events. This aims to facilitate quick identification of
  deployment activities and troubleshooting issues.
- Updated the dashboard version to reflect these changes, ensuring that
  the dashboard remains up-to-date and functional with the latest
  configurations.

This enhancement improves the observability of the deployment process,
making it easier for operators to monitor deployment activities and
investigate issues directly from the Grafana interface.

scripts/govtool/config/templates/grafana-provisioning/dashboards/govtool.json

@@ -18,7 +18,6 @@
   "editable": true,
   "fiscalYearStartMonth": 0,
   "graphTooltip": 0,
-  "id": 3,
   "links": [],
   "liveNow": false,
   "panels": [
@@ -861,6 +860,45 @@
       ],
       "title": "System load (avg 5 min)",
       "type": "timeseries"
+    },
+    {
+      "datasource": {
+        "type": "loki",
+        "uid": "b0d64f25-3bca-4cc1-b8f3-6b391d88b442"
+      },
+      "description": "Trace of every deploy made on this machine. This is a good place to start when something goes wrong.",
+      "gridPos": {
+        "h": 4,
+        "w": 21,
+        "x": 0,
+        "y": 22
+      },
+      "id": 12,
+      "options": {
+        "dedupStrategy": "none",
+        "enableLogDetails": true,
+        "prettifyLogMessage": false,
+        "showCommonLabels": false,
+        "showLabels": false,
+        "showTime": false,
+        "sortOrder": "Descending",
+        "wrapLogMessage": false
+      },
+      "targets": [
+        {
+          "datasource": {
+            "type": "loki",
+            "uid": "b0d64f25-3bca-4cc1-b8f3-6b391d88b442"
+          },
+          "editorMode": "builder",
+          "expr": "{filename=\"/var/log/deployment.log\"}",
+          "queryType": "range",
+          "refId": "A"
+        }
+      ],
+      "timeFrom": "1w",
+      "title": "Deployment events",
+      "type": "logs"
     }
   ],
   "refresh": "10s",
@@ -878,6 +916,6 @@
   "timezone": "",
   "title": "GovTool basic stats",
   "uid": "e3697f62-6a01-4596-b626-d46141441b32",
-  "version": 1,
+  "version": 36,
   "weekStart": ""
 }