Add workflow for automated Docker builds on project changes

.github/workflows/build-push-sandbox.yml

@@ -0,0 +1,139 @@
+name: Build and Push Project Sandbox Images
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - "_assets/**"
+      - ".github/**"
+      - ".gitignore"
+      - ".gitmodules"
+      - ".typos.toml"
+      - "CODE-OF-CONDUCT.md"
+      - "CONTRIBUTING.md"
+      - "generate_sandbox_dockerfile.py"
+      - "generate_zenml_project.py"
+      - "LICENSE"
+      - "pyproject.toml"
+      - "README.md"
+
+  workflow_dispatch:
+    inputs:
+      project:
+        description: "Project to build (leave empty to detect from changed files)"
+        required: false
+        default: ""
+
+jobs:
+  detect-changes:
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 2
+
+      - name: Detect changed projects
+        id: set-matrix
+        run: |
+          if [ "${{ github.event_name }}" == "workflow_dispatch" ]; then
+            if [ -n "${{ github.event.inputs.project }}" ]; then
+              PROJECTS="[\"${{ github.event.inputs.project }}\"]"
+            else
+              # Auto-detect changed files (same logic as push events)
+              CHANGED_FILES=$(git diff --name-only HEAD^ HEAD)
+              CHANGED_DIRS=$(echo "$CHANGED_FILES" | grep -o "^[^/]*" | sort -u | grep -v "^$")
+              ALL_PROJECT_DIRS=$(find . -maxdepth 1 -type d -not -path "*/\.*" -not -path "." | sed 's|^\./||' | grep -v "^_")
+              PROJECTS="["
+              COMMA=""
+              for DIR in $CHANGED_DIRS; do
+                if echo "$ALL_PROJECT_DIRS" | grep -q "^$DIR$"; then
+                  PROJECTS="${PROJECTS}${COMMA}\"${DIR}\""
+                  COMMA=","
+                fi
+              done
+              PROJECTS="${PROJECTS}]"
+            fi
+          else
+            CHANGED_FILES=$(git diff --name-only HEAD^ HEAD)
+            CHANGED_DIRS=$(echo "$CHANGED_FILES" | grep -o "^[^/]*" | sort -u | grep -v "^$")
+            ALL_PROJECT_DIRS=$(find . -maxdepth 1 -type d -not -path "*/\.*" -not -path "." | sed 's|^\./||' | grep -v "^_")
+            PROJECTS="["
+            COMMA=""
+            for DIR in $CHANGED_DIRS; do
+              if echo "$ALL_PROJECT_DIRS" | grep -q "^$DIR$"; then
+                PROJECTS="${PROJECTS}${COMMA}\"${DIR}\""
+                COMMA=","
+              fi
+            done
+            PROJECTS="${PROJECTS}]"
+          fi
+          echo "matrix=$PROJECTS" >> $GITHUB_OUTPUT
+          echo "Projects to build: $PROJECTS"
+
+  build-and-push:
+    needs: detect-changes
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        project: ${{ fromJson(needs.detect-changes.outputs.matrix) }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Check for Dockerfile.sandbox
+        id: check-dockerfile
+        run: |
+          if [ -f "${{ matrix.project }}/Dockerfile.sandbox" ]; then
+            echo "dockerfile_exists=true" >> $GITHUB_OUTPUT
+          else
+            echo "dockerfile_exists=false" >> $GITHUB_OUTPUT
+            echo "No Dockerfile.sandbox found in ${{ matrix.project }}, will generate one."
+          fi
+
+      - name: Set up Python
+        if: steps.check-dockerfile.outputs.dockerfile_exists == 'false'
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.10"
+
+      - name: Generate Dockerfile.sandbox if needed
+        if: steps.check-dockerfile.outputs.dockerfile_exists == 'false'
+        run: |
+          python generate_sandbox_dockerfile.py "${{ matrix.project }}"
+          echo "Generated Dockerfile.sandbox for ${{ matrix.project }}"
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: ${{ matrix.project }}/Dockerfile.sandbox
+          push: true
+          tags: |
+            safoinext/zenml-sandbox-${{ matrix.project }}:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Commit Dockerfile if newly generated
+        if: steps.check-dockerfile.outputs.dockerfile_exists == 'false'
+        run: |
+          git config --local user.email "github-actions[bot]@users.noreply.github.com"
+          git config --local user.name "github-actions[bot]"
+          git add "${{ matrix.project }}/Dockerfile.sandbox"
+          git commit -m "Auto-generate Dockerfile.sandbox for ${{ matrix.project }}"
+          git push || echo "Failed to push changes, but Docker image was still built and pushed."