Add startup check to ensure we can convert the heic files

lib/pleroma/application_requirements.ex

@@ -162,7 +162,8 @@ defmodule Pleroma.ApplicationRequirements do
     filter_commands_statuses = [
       check_filter(Pleroma.Upload.Filters.Exiftool, "exiftool"),
       check_filter(Pleroma.Upload.Filters.Mogrify, "mogrify"),
-      check_filter(Pleroma.Upload.Filters.Mogrifun, "mogrify")
+      check_filter(Pleroma.Upload.Filters.Mogrifun, "mogrify"),
+      check_filter(Pleroma.Upload.Filters.HeifToJpeg, "mogrify")
     ]
 
     preview_proxy_commands_status =
@@ -213,6 +214,31 @@ defmodule Pleroma.ApplicationRequirements do
 
   defp check_repo_pool_size!(result), do: result
 
+  defp check_filter(:"Elixir.Pleroma.Upload.Filter.HeifToJpeg" = filter, command_required) do
+    filters = Config.get([Pleroma.Upload, :filters])
+
+    if filter in filters && Pleroma.Utils.command_available?(command_required) do
+      output =
+        String.to_charlist("#{command_required} --version")
+        |> :os.cmd()
+        |> String.Chars.to_string()
+        |> String.split()
+
+      cond do
+        "heic" in output ->
+          true
+
+        true ->
+          Logger.error(
+            "#{filter} is specified in the list of Pleroma.Upload filters, but the " <>
+              "#{command_required} does not support heic files."
+          )
+
+          false
+      end
+    end
+  end
+
   defp check_filter(filter, command_required) do
     filters = Config.get([Pleroma.Upload, :filters])