Add Windows external tools

build/ci/drone.yml

@@ -15,10 +15,27 @@ steps:
   - go build .
   - CGO_ENABLED=0 GOOS=windows go build -a -installsuffix cgo -o dlserver.exe .
 
+- name: get_win_ffmpeg
+  image: busybox
+  commands:
+  - mkdir tmp
+  - cd tmp
+  - wget http://www.gyan.dev/ffmpeg/builds/packages/ffmpeg-4.3.1-essentials_build.zip
+  - unzip ffmpeg-4.3.1-essentials_build.zip
+
+- name: get_win_ytdl
+  image: busybox
+  commands:
+  - mkdir tmp
+  - cd tmp
+  - wget https://github.com/ytdl-org/youtube-dl/releases/download/2020.09.14/youtube-dl.exe
+
 - name: build_godot_windows
   image: barichello/godot-ci:3.2.3
   commands:
   - cp dlserver/dlserver.exe godot/
+  - cp tmp/ffmpeg.exe godot/
+  - cp tmp/youtube-dl.exe godot/
   - cd godot/
   - mkdir -v -p build/windows
   - godot -v --export "win64" build/windows/asingcrow.exe