Windows Desktop Client CI (#2)

Adds a windows container build and a windows client build.
Outstanding issues:
- I'm not sure if `workflow_dispatch` works. Based on [this PR](https://github.com/go-gitea/gitea/pull/28163) it seems like it should, but I don't see a button. It might only work after merging into the default branch.
- The windows build container is building dioxus from git HEAD because there is an unreleased bugfix we are depending on. We should revert this to a versioned release (maybe using `binstall`) once they cut 0.7.2

Reviewed-on: #2

docker/docker-compose.yaml

@@ -48,8 +48,6 @@ services:
     ports:
       - "64738:64738/tcp"
       - "64738:64738/udp"
-    environment:
-      - MUMBLE_CONFIG_WELCOMETEXT=Welcome to the Mumble server
     network_mode: host
 #volumes:
 #  caddy_data: