Don't use renv cache with docker

Dockerfile

@@ -2,6 +2,10 @@ FROM rocker/shiny-verse:latest
 
 WORKDIR /code
 
+# Cache doesn't help for single-use containers (and huggingface
+# spaces don't let us write to renv's default cache path)
+ENV RENV_CONFIG_CACHE_ENABLED=FALSE
+
 RUN R --quiet -e "install.packages('renv'); renv::init()"
 
 COPY ./renv.lock /code/renv.lock