Binary distributions via GitHub Releases.

For all triggering events, the workflow builds
SimpleITK using the installer, creates
binary packages from the results and uploads the
artifacts to GitHub.

When the triggering event is a tag push that
matches the SITK_TARGET (DESCRIPTION file) a
draft release is created and the packages are
uploaded to it.

Author: zivy

.github/workflows/main.yml

@@ -2,6 +2,8 @@ on:
   push:
     branches:
       - main
+    tags:
+      - 'v*'  # Trigger on version tags
   pull_request:
     branches:
       - main
@@ -28,6 +30,7 @@ jobs:
       with:
         fetch-depth: 0
         ref: ${{ github.event.pull_request.head.sha }}
+
     - name: Setup R
       uses: r-lib/actions/setup-r@v2
       with:
@@ -55,11 +58,103 @@ jobs:
     - name: Install R packages
       shell: bash
       run: |
-        R -e "install.packages(c('remotes'), lib=Sys.getenv('R_LIBS'), repos='https://cloud.r-project.org/')"
+        R -e "install.packages(c('remotes', 'pkgbuild'), lib=Sys.getenv('R_LIBS'), repos='https://cloud.r-project.org/')"
     - name: Build and test
       shell: bash
       env:
         ITK_GLOBAL_DEFAULT_NUMBER_OF_THREADS: 2
       run: |
         R -e "Sys.setenv(MAKEJ=2); remotes::install_git(c('.'), lib=Sys.getenv('R_LIBS'))"
         R -e "library(SimpleITK); Version()"
+    - name: Create binary package from installed package
+      id: create_package
+      shell: bash
+      run: |
+        # Get the R version for naming
+        R_VERSION="${{ matrix.R }}"
+        R_VERSION_SHORT=$(echo $R_VERSION | cut -d'.' -f1,2)
+        # Create output directory for artifacts
+        mkdir -p artifacts
+        # Build binary package from the installed package (no recompilation needed)
+        # The configure script already built everything and remotes::install_git installed it
+        R -e "pkg <- file.path(Sys.getenv('R_LIBS'), 'SimpleITK'); pkgbuild::build(pkg, dest_path='artifacts', binary=TRUE)"
+        # Rename with descriptive platform info
+        if [[ "$RUNNER_OS" == "macOS" ]]; then
+          PKG_FILE=$(ls artifacts/SimpleITK_*.tgz)
+          NEW_NAME="${PKG_FILE%.tgz}_R${R_VERSION_SHORT}_macos-x86_64.tgz"
+        elif [[ "$RUNNER_OS" == "Linux" ]]; then
+          PKG_FILE=$(ls artifacts/SimpleITK_*.tar.gz)
+          NEW_NAME="${PKG_FILE%.tar.gz}_R${R_VERSION_SHORT}_linux-x86_64.tar.gz"
+        elif [[ "$RUNNER_OS" == "Windows" ]]; then
+          PKG_FILE=$(ls artifacts/SimpleITK_*.zip)
+          NEW_NAME="${PKG_FILE%.zip}_R${R_VERSION_SHORT}_windows-x86_64.zip"
+        fi
+        mv "$PKG_FILE" "$NEW_NAME"
+        ls -lh artifacts/
+    - name: Upload binary package
+      if: steps.create_package.outcome == 'success'
+      uses: actions/upload-artifact@v4
+      with:
+        name: SimpleITK-${{ matrix.R }}-${{ matrix.os }}
+        path: artifacts/*
+        retention-days: 30
+
+  create-release:
+    name: Create GitHub Draft Release
+    # Only run this job for tag pushes after the R-build job completes
+    # successfully.
+    if: startsWith(github.ref, 'refs/tags/v')
+    needs: R-build
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v6
+      with:
+        fetch-depth: 1
+
+    - name: Verify tag matches SITK_TARGET
+      id: verify_tag
+      run: |
+        SITK_TARGET=$(grep '^SITK_TARGET:' DESCRIPTION | awk '{print $2}')
+        TAG_NAME="${{ github.ref_name }}"
+        if [ "${TAG_NAME}" != "${SITK_TARGET}" ]; then
+          echo "Tag ${TAG_NAME} does not match SITK_TARGET ${SITK_TARGET}"
+          echo "Skipping draft release creation."
+          echo "draft_release=false" >> $GITHUB_OUTPUT
+        else
+          echo "draft_release=true" >> $GITHUB_OUTPUT
+        fi
+
+    - name: Download all artifacts
+      if: steps.verify_tag.outputs.draft_release == 'true'
+      uses: actions/download-artifact@v4
+      with:
+        path: release-artifacts
+        pattern: SimpleITK-*
+        merge-multiple: true
+
+    - name: Display downloaded artifacts
+      if: steps.verify_tag.outputs.draft_release == 'true'
+      run: |
+        echo "Downloaded artifacts:"
+        ls -lhR release-artifacts/
+
+    # This action automatically creates the release if it doesn't exist,
+    # or updates it if it does.
+    - name: Create or Update Draft Release
+      if: steps.verify_tag.outputs.draft_release == 'true'
+      uses: softprops/action-gh-release@v2
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        draft: true
+        name: SimpleITK ${{ github.ref_name }} R Package Release
+        body: |
+          Please review and test the packages before publishing this release.
+          Then remove the "Draft" status to make it public and delete this message.
+        files: |
+          release-artifacts/*
+        fail_on_unmatched_files: true