docs: warn for broken container

README.md

@@ -67,7 +67,7 @@ CGO_ENABLED=0 go build
 
 ## config
 
-`config.toml`:
+Full `config.toml`:
 
 ```toml
 dry_run = true                          # set to `false` for real run
@@ -148,7 +148,8 @@ a bot" together with cookies.
 
 Either add a manually generated POT to the config: `po_token =
 "{TOKEN}"` or, set up bgutils[2] with the youtube extractor to do POT
-generation automatically.
+generation automatically, in which case, leave the `po_token` as an
+empty string (`""`).
 
 ```
 # assumes pipx was used to install yt-dlp
@@ -213,6 +214,9 @@ WantedBy=timers.target
 
 ## container
 
+> [!CAUTION]
+> The image is currently broken
+
 ```
 podman run --rm \
     --env='CONFIG=/data/config.toml' \