Add minimal alpine image

Signed-off-by: Peter Solymos <psolymos@gmail.com>

r-shiny/Dockerfile.minimal

@@ -0,0 +1,34 @@
+# Define the parent image
+FROM rhub/r-minimal:4.4.1
+
+# Install dependencies
+# -d    install C and C++ compilers, temporarily
+# -t    install Alpine packages, temporarily
+# -a    install Alpine packages and keep them
+RUN installr -d \
+    -t "zlib-dev cairo-dev" \
+    -a "cairo font-liberation" \
+    Cairo \
+    shiny
+
+# Add non-root user and group
+RUN addgroup --system app && \
+    adduser --system --ingroup app app
+
+# Set working directory to home of the non-root user
+WORKDIR /home/app
+
+# Copy Shiny app files
+COPY app .
+
+# Set owner for the home folder
+RUN chown app:app -R /home/app
+
+# Set user to non-root
+USER app
+
+# Expose port
+EXPOSE 3838
+
+# Set command to execute at runtime
+CMD ["R", "-e", "shiny::runApp(host='0.0.0.0', port=3838)"]

r-shiny/README.md

@@ -20,7 +20,8 @@ docker pull ghcr.io/h10y/faithful/r-shiny:latest
 docker run -p 8080:3838 ghcr.io/h10y/faithful/r-shiny:latest
 ```
 
-Containerized version:
+Containerized version using `rocker/r2u`
+[image size: 909MB, build time: 16 sec]
 
 ```bash
 # Change directory
@@ -38,3 +39,23 @@ docker build -t $TAG .
 # Run image, visit http://localhost:8080
 docker run --rm -p 8080:3838 $TAG
 ```
+
+Using `rhub/r-minimal` from <https://github.com/r-hub/r-minimal/>.
+[Image size: 113MB, build time: 5 min]
+
+```bash
+# Change directory
+cd r-shiny
+
+# If on MacOS X, set this
+export DOCKER_DEFAULT_PLATFORM=linux/amd64
+
+# Specify tag
+export TAG=faithful/r-shiny:minimal
+
+# Build image
+docker build -t $TAG -f Dockerfile.minimal .
+
+# Run image, visit http://localhost:8080
+docker run --rm -p 8080:3838 $TAG
+```