update for session_3

src/Dockerfile

@@ -2,10 +2,16 @@ FROM rocker/tidyverse
 
 RUN apt-get update \
     && apt-get install -y \
-    libxt6
+    libxt6 \
+    cargo
 
 RUN Rscript -e "install.packages('rmdformats')"
 
 #session 1
 RUN Rscript -e "install.packages('rvest')"
 RUN Rscript -e "install.packages('remotes'); remotes::install_github('rlesur/klippy')"
+
+#session 3
+RUN Rscript -e "install.packages('gganimate')"
+RUN Rscript -e "install.packages('gifski')"
+RUN Rscript -e "install.packages('openxlsx')"