Use standard rocker image

This uses the standard Rocker image and saves use over 3 gig in space (see [comment](opensafely-core#9 (comment))).

It also moves the renv setup into a separate script, where we also setup the
rstudio environment.

.devcontainer/Dockerfile

@@ -1,4 +1,4 @@
-FROM remlapmot/r-docker:2024-04-02-rstudio-renv-1-0-7
+FROM rocker/rstudio:4.0.5
 
 # we are going to use an apt cache on the host, so disable the default debian
 # docker clean up that deletes that cache on every apt install
@@ -14,11 +14,11 @@ RUN --mount=type=cache,target=/var/cache/apt \
     # Pip for Python 3.10 isn't included in deadsnakes, so install separately
     curl https://bootstrap.pypa.io/get-pip.py | python3.10
 
-# copy the renv directory from the OpenSAFELY R action image and active it by
-# default
-RUN R -e 'renv::init(bare = TRUE)'
+# install renv
+RUN --mount=type=cache,target=/cache,id=/cache-2004 R -e 'install.packages("renv", destdir="/cache"); renv::init(bare = TRUE)'
+
+# copy the renv directory from the OpenSAFELY R action image
 COPY --from=ghcr.io/opensafely-core/r /renv/ /renv/
-RUN echo 'source("/renv/renv/activate.R")' >> /etc/R/Rprofile.site
 
 # Copy the Python virtualenv from OpenSAFELY Python action image
 COPY --from=ghcr.io/opensafely-core/python:v2 /opt/venv /opt/venv

.devcontainer/devcontainer.json

@@ -15,7 +15,7 @@
             "dockerDashComposeVersion": "v2"
         }
     },
-    "postCreateCommand": "pip3 install --user -r .devcontainer/requirements.in",
+    "postCreateCommand": "/bin/bash .devcontainer/postCreate.sh",
     "postAttachCommand": {
         "rstudio-start": "sudo rstudio-server start"
     },

.devcontainer/postCreate.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -euo pipefail 
+
+pip3 install --user -r .devcontainer/requirements.in
+
+#set R working directory
+! grep -q `pwd` $R_HOME/etc/Rprofile.site && sudo tee -a $R_HOME/etc/Rprofile.site <<< "setwd(\"`pwd`\")"
+#set RStudio working directory
+! grep -q `pwd` ~/.config/rstudio/rstudio-prefs.json && cat ~/.config/rstudio/rstudio-prefs.json | jq ". + {\"initial_working_directory\":\"`pwd`\"}" >  ~/.config/rstudio/rstudio-prefs.json