Add managed Gitea updates and server installer

update.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"encoding/json"
+	"os"
+	"time"
+)
+
+const defaultUpdateStatusPath = "/var/lib/proxmox-dashboard/update-status.json"
+
+type UpdateStatus struct {
+	CurrentVersion   string    `json:"currentVersion"`
+	AvailableVersion string    `json:"availableVersion"`
+	State            string    `json:"state"`
+	Mode             string    `json:"mode"`
+	Message          string    `json:"message"`
+	ReleaseURL       string    `json:"releaseUrl"`
+	CheckedAt        time.Time `json:"checkedAt"`
+}
+
+func readUpdateStatus() UpdateStatus {
+	status := UpdateStatus{CurrentVersion: version, State: "unknown", Mode: "notify"}
+	path := os.Getenv("DASHBOARD_UPDATE_STATUS_PATH")
+	if path == "" {
+		path = defaultUpdateStatusPath
+	}
+	data, err := os.ReadFile(path)
+	if err != nil || json.Unmarshal(data, &status) != nil {
+		return status
+	}
+	status.CurrentVersion = version
+	return status
+}