Add GH Action to produce direct links to download example subprojects

Author: koperagen

.github/workflows/archive-examples.yml

@@ -0,0 +1,81 @@
+  name: Archive Example Projects
+
+  on:
+    push:
+      branches:
+        - master
+      paths:
+        - 'examples/android-example/**'
+        - 'examples/kotlin-dataframe-plugin-example/**'
+    workflow_dispatch:
+
+  jobs:
+    build-archives:
+      runs-on: ubuntu-latest
+
+      steps:
+        - name: Checkout code
+          uses: actions/checkout@v4
+
+        - name: Create android-example archive
+          run: |
+            cd examples/android-example
+            zip -r ../../android-example.zip . -x "*.git*" "build/*" ".gradle/*" "*/build/*"
+
+        - name: Create kotlin-dataframe-plugin-example archive
+          run: |
+            cd examples/kotlin-dataframe-plugin-example
+            zip -r ../../kotlin-dataframe-plugin-example.zip . -x "*.git*" "build/*" ".gradle/*" "*/build/*"
+
+        - name: Checkout example-projects-archives branch
+          run: |
+            git config user.name "github-actions[bot]"
+            git config user.email "github-actions[bot]@users.noreply.github.com"
+            
+            if git ls-remote --exit-code --heads origin example-projects-archives; then
+              git fetch origin example-projects-archives
+              git checkout example-projects-archives
+            else
+              git checkout --orphan example-projects-archives
+              git rm -rf .
+            fi
+
+        - name: Update archives
+          run: |
+            git rm -f *.zip 2>/dev/null || true
+            
+            mv android-example.zip .
+            mv kotlin-dataframe-plugin-example.zip .
+            
+            cat > README.md << 'EOF'
+            # Kotlin DataFrame - Example Projects Archives
+            
+            Automatically generated archives of example projects.
+            
+            ## Available archives:
+            
+            ### Android Example
+            Example of using Kotlin DataFrame in an Android application.
+            
+            **Download:** [android-example.zip](https://github.com/Kotlin/dataframe/raw/example-projects-archives/android-example.zip)
+            
+            ### Kotlin DataFrame Plugin Example
+            Example of using the compiler plugin for Kotlin DataFrame.
+            
+            **Download:** [kotlin-dataframe-plugin-example.zip](https://github.com/Kotlin/dataframe/raw/example-projects-archives/kotlin-dataframe-plugin-example.zip)
+            
+            ---
+            
+            Last updated: $(date -u '+%Y-%m-%d %H:%M:%S UTC')
+            
+            Source commit: ${{ github.sha }}
+            EOF
+            
+            git add .
+            git commit -m "Update example archives from ${{ github.sha }}" || echo "No changes to commit"
+
+        - name: Push to example-projects-archives branch
+          run: |
+            git push -f origin example-projects-archives
+          env:
+            GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}