Dockerfiles: makefile and readme.

.gitlab-ci.yml

-# Use the shiny-verse Docker image for the run
-# (Includes, devtools, tidyverse, ...)
-# https://hub.docker.com/r/rocker/shiny-verse/
-image: registry.forgemia.inra.fr/umr-astre/mapmcda/mapmcda_testenv
-
-
 pages:         
   stage: deploy
   script:

dockerfiles/Makefile

+VERS=$(subst test_environment/Dockerfile_,,$(wildcard test_environment/Dockerfile_*))
+
+.PHONY: debug build push
+.PHONY: $(VERS) $(addprefix push,$(VERS))
+
+all: build push
+
+debug: 
+	@echo "R versions: $(VERS)"
+
+build: $(VERS)
+
+# https://www.gnu.org/software/make/manual/make.html#Static-Pattern
+$(VERS): %: test_environment/Dockerfile_%
+	docker build --pull=true -f $< \
+	-t registry.forgemia.inra.fr/umr-astre/mapmcda/mapmcda_testenv:$@ \
+	..
+
+push: $(addprefix push_,$(VERS))
+
+$(addprefix push_,$(VERS)): push_%: %
+	docker push registry.forgemia.inra.fr/umr-astre/mapmcda/mapmcda_testenv:$<

dockerfiles/Readme.md

-# Build
+# Testing environments for mapMCDA
 
-Run from within project root (build context):
+Under `test_environment` we store Dockerfiles defining three computing environments
+for testing mapMCDA:
+
+- `oldrel`: the latest major release of R,
+
+- `release`: the current release of R
+
+- `devel`: the next major release, under development
+
+The images are built locally (see Makefile) and pushed to the [Docker registry
+at Forgemia](https://forgemia.inra.fr/umr-astre/mapMCDA/container_registry).
+
+These images are used for Continuous Integration testing ([`.gitlab-ci.yml`](https://forgemia.inra.fr/umr-astre/mapMCDA/-/blob/master/.gitlab-ci.yml)).
+
+The images are based on the [Rocker-versioned
+images](https://hub.docker.com/r/rocker/r-ver) which in turn are based on either
+Debian (for R < 4.0) or Ubuntu (for R >= 4.0).
+
+For `oldrel`, package dependencies are installed from a CRAN snapshot at the
+last date that particular R version was current. The result is an old R version
+with contemporary versions of R-packages (i.e. not latest versions).
 
-    docker build . -f dev/dockerfiles/test_environment/Dockerfile_release -t registry.forgemia.inra.fr/umr-astre/mapmcda/mapmcda_testenv:release --pull=true
 
 # Run
 
-docker run --rm -ti -p 8787:8787 registry.forgemia.inra.fr/umr-astre/mapmcda/mapmcda_testenv
+You can experiment with a container using the development version of R with
+all needed mapMCDA dependencies from both the system and R-packages.
+
 
+    docker run --rm -ti registry.forgemia.inra.fr/umr-astre/mapmcda/mapmcda_testenv:devel