Fix docker image caching. Add version indicator to admin UI

docker/Dockerfile.deb

@@ -15,7 +15,7 @@ ARG GITEA_REPO=rustdesk-server
 ARG GITEA_BRANCH=pro-features
 # When set, the script downloads this URL directly and skips API discovery.
 ARG ARTIFACT_URL=
-ARG CACHE_BUST=0
+ARG CACHE_BUST=$(date +%s)
 
 ENV DEBIAN_FRONTEND=noninteractive
 
@@ -27,7 +27,8 @@ RUN apt-get update \
 COPY fetch-artifact.sh /usr/local/sbin/fetch-artifact.sh
 RUN chmod +x /usr/local/sbin/fetch-artifact.sh
 
-RUN GITEA_URL="$GITEA_URL" GITEA_OWNER="$GITEA_OWNER" GITEA_REPO="$GITEA_REPO" \
+RUN echo "cache-bust=$CACHE_BUST" \
+ && GITEA_URL="$GITEA_URL" GITEA_OWNER="$GITEA_OWNER" GITEA_REPO="$GITEA_REPO" \
     GITEA_BRANCH="$GITEA_BRANCH" ARTIFACT_URL="$ARTIFACT_URL" \
     /usr/local/sbin/fetch-artifact.sh