added github workflow for dockerhub publishing

Author: rela-v

.github/workflows/docker-publish.yml

@@ -0,0 +1,48 @@
+name: Build and Push to Docker Hub
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      # 1. Set up Docker Buildx (required for GHA caching)
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      # 2. Login to Docker Hub using Organization Secret
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_API_KEY }}
+
+      # 3. Extract metadata (Tags/Labels) for Docker
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ secrets.DOCKERHUB_USERNAME }}/3podr_container
+          tags: |
+            type=ref,event=branch
+            type=sha,format=short
+            latest
+
+      # 4. Build and Push with GHA Cache
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          # Magic for GitHub Actions speed:
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile

@@ -1,29 +1,39 @@
-# 1. Use r-ver for native Apple Silicon (ARM64) support
+# 1. Use r-ver (Works on Mac ARM64 and GitHub AMD64)
 FROM rocker/r-ver:latest
 
-# 2. Install system dependencies + Pandoc (Critical for RMarkdown)
-RUN apt-get update && apt-get install -y \
+# 2. Install system dependencies + Pandoc
+# Added image libraries (libpng, libjpeg) and string processing (libicu)
+RUN apt-get update && apt-get install -y --no-install-recommends \
     libxml2-dev \
     libssl-dev \
+    libcurl4-openssl-dev \
+    libpng-dev \
+    libjpeg-dev \
+    zlib1g-dev \
+    libicu-dev \
     pandoc \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /project
 
-# 3. Setup renv files
+# 3. FORCE BINARIES & PARALLELISM
+ENV RENV_CONFIG_REPOS_OVERRIDE="https://packagemanager.posit.co/cran/__linux__/jammy/latest"
+ENV RENV_DOWNLOAD_METHOD="libcurl"
+ENV RENV_PATHS_LIBRARY="renv/library"
+
+# 4. Setup renv files
 COPY renv.lock .Rprofile ./
 COPY renv/activate.R renv/activate.R
-RUN mkdir -p renv library data
+# Pre-create the library folder
+RUN mkdir -p renv/library data
 
-# 4. SPEED BOOST: 
-# - Use 'jammy' binaries (pre-compiled for the container's Ubuntu base)
-# - Use all CPU cores (Ncpus) to install 200+ packages in parallel
-RUN R -e "options(repos = c(CRAN = 'https://packagemanager.posit.co/cran/__linux__/jammy/latest'), Ncpus = parallel::detectCores()); renv::restore()"
+# 5. Restore using all available CPU cores
+# This will now find the 'png.h' header it needs for the 'png' package
+RUN R -e "options(Ncpus = parallel::detectCores()); renv::restore()"
 
-# 5. Copy your Rmd files and site configuration
-# Use a wildcard for _site.yml so it doesn't crash if the file is missing
+# 6. Copy project assets
 COPY *.Rmd ./
 COPY _site.ym[l] ./ 
 
-# 6. Render the site
+# 7. Render
 CMD ["R", "-e", "rmarkdown::render_site()"]