update ci Dockerfile to R 4.0.0

Author: eddelbuettel

ChangeLog

@@ -3,6 +3,9 @@
 	* inst/include/Rcpp/sugar/functions/sample.h: Replace R_alloc() with
 	a standard vector allocation to reduce memory consumption in sample
 
+	* docker/ci/Dockerfile: Update for R 4.0.0 (with a temporary
+	diversion to rocker/r-base:4.0.0, and all-source installations)
+
 2020-04-16  Dirk Eddelbuettel  <[email protected]>
 
 	* DESCRIPTION (Version, Date): Roll minor version

docker/ci/Dockerfile

@@ -1,19 +1,27 @@
 ## Emacs, make this -*- mode: sh; -*-
 
-FROM r-base:latest
+#FROM r-base:latest
+FROM rocker/r-base:4.0.0
 
 LABEL org.label-schema.license="GPL-2.0" \
       org.label-schema.vcs-url="https://github.com/RcppCore/Rcpp" \
       maintainer="Dirk Eddelbuettel <[email protected]>"
 
+# RUN apt-get update \
+#         && apt-get install -y --no-install-recommends \
+#                 libcurl4-openssl-dev \
+#                 libssl-dev \
+#                 r-cran-inline \
+#                 r-cran-pkgkitten \
+#                 git \
+#         && install.r covr rbenchmark tinytest
+
 RUN apt-get update \
-        && apt-get install -y --no-install-recommends \
-                libcurl4-openssl-dev \
-                libssl-dev \
-                r-cran-inline \
-                r-cran-pkgkitten \
-                git \
-        && install.r covr rbenchmark tinytest
+    && apt-get install -y --no-install-recommends \
+               libcurl4-openssl-dev \
+               libssl-dev \
+               git \
+    && install.r covr inline pkgKitten rbenchmark tinytest
 
 ENV _R_CHECK_FORCE_SUGGESTS_ FALSE
 ENV _R_CHECK_TESTS_NLINES_ 0