Add Pleroma.Upload.Filter.HeifToJpeg based on vips

test/pleroma/upload/filter/heif_to_jpeg_test.exs

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Upload.Filter.HeifToJpegTest do
+  use Pleroma.DataCase, async: true
+  alias Pleroma.Upload.Filter
+
+  test "apply HeicToJpeg filter" do
+    File.cp!(
+      "test/fixtures/image.heic",
+      "test/fixtures/heictmp"
+    )
+
+    upload = %Pleroma.Upload{
+      name: "image.heic",
+      content_type: "image/heic",
+      path: Path.absname("test/fixtures/image.heic"),
+      tempfile: Path.absname("test/fixtures/heictmp")
+    }
+
+    {:ok, :filtered, result} = Filter.HeifToJpeg.filter(upload)
+
+    assert result.content_type == "image/jpeg"
+    assert result.name == "image.jpg"
+    assert String.ends_with?(result.path, "jpg")
+
+    assert {:ok,
+            %Majic.Result{
+              content:
+                "JPEG image data, JFIF standard 1.02, resolution (DPI), density 96x96, segment length 16, progressive, precision 8, 1024x768, components 3",
+              encoding: "binary",
+              mime_type: "image/jpeg"
+            }} == Majic.perform(result.path, pool: Pleroma.MajicPool)
+
+    on_exit(fn -> File.rm!("test/fixtures/heictmp") end)
+  end
+end