update to multiplatform and add cache

.gitea/workflows/build_docker.yml

@@ -3,6 +3,7 @@ on:
   push:
     branches:
       - master
+  workflow_dispatch:
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -25,9 +26,12 @@ jobs:
         with:
           context: .
           push: true
+          platforms: linux/amd64,linux/arm64
           tags: |
             gitea.suda.codes/sudacode/mpv-youtube-queue-server:${{ env.current_version }}
             gitea.suda.codes/sudacode/mpv-youtube-queue-server:latest
+          cache-from: type=registry,ref=gitea.suda.codes/sudacode/mpv-youtube-queue-server:latest
+          cache-to: type=inline
 
       - name: Log out from Gitea Docker Registry
         run: docker logout https://gitea.suda.codes