ImmichFrame: check .NET SDK before update deployment (#16104)

* fix(immichframe): check SDK before update deployment

* fix(immichframe): install SDK during update

ct/immichframe.sh

@@ -30,6 +30,25 @@ function update_script() {
     exit
   fi
 
+  if ! dotnet --list-sdks 2>/dev/null | grep -q '^8\.'; then
+    msg_info "Installing .NET SDK 8.0"
+    if [[ "$(arch_resolve)" == "arm64" ]]; then
+      curl -fsSL https://dot.net/v1/dotnet-install.sh -o /tmp/dotnet-install.sh
+      $STD bash /tmp/dotnet-install.sh --channel 8.0 --install-dir /usr/lib/dotnet8
+      ln -sf /usr/lib/dotnet8/dotnet /usr/bin/dotnet
+      rm -f /tmp/dotnet-install.sh
+    else
+      setup_deb822_repo \
+        "microsoft" \
+        "https://packages.microsoft.com/keys/microsoft-2025.asc" \
+        "https://packages.microsoft.com/debian/13/prod/" \
+        "trixie" \
+        "main"
+      $STD apt install -y dotnet-sdk-8.0
+    fi
+    msg_ok "Installed .NET SDK 8.0"
+  fi
+
   if check_for_gh_release "immichframe" "immichFrame/ImmichFrame"; then
     msg_info "Stopping Service"
     systemctl stop immichframe