Add a new devcontainer for ancient R (#6381)

* Add a new devcontainer for ancient R

* ws

* ws

* Can't use |>

* Use ';' (not real newlines in docker string)

* Add repos=; skip unavailable packages

* Missing ')'

.devcontainer/r-ancient-gcc/Dockerfile

@@ -0,0 +1,19 @@
+FROM registry.gitlab.com/jangorecki/dockerfiles/r-3.3.0
+
+RUN apt-get -qq update \
+  && apt-get install -y --no-install-recommends git
+
+COPY DESCRIPTION .
+
+RUN Rscript -e '                                         \ 
+options(repos = "https://cloud.r-project.org");          \
+dcf = read.dcf("DESCRIPTION", c("Imports", "Suggests")); \
+deps = names(tools:::.split_dependencies(dcf));          \
+standard_pkgs = tools:::.get_standard_package_names();   \
+deps = intersect(deps, rownames(available.packages()));  \
+install.packages(setdiff(deps, standard_pkgs$base));     \
+'
+
+# setup cc()
+WORKDIR /root
+COPY .devcontainer/.Rprofile .

.devcontainer/r-ancient-gcc/devcontainer.json

@@ -0,0 +1,9 @@
+{
+  "build": { "dockerfile": "Dockerfile", "context": "../.." },
+  "customizations": { "vscode": {
+     "extensions": [
+      "REditorSupport.r",
+      "ms-vscode.cpptools-extension-pack"
+     ]
+  }}
+}