Add Dockerfile and GitHub Actions workflow for KNIME extension build

Author: marc-lehner

.github/workflows/Dockerfile

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+# Define the base image
+FROM public.ecr.aws/i0n0z6j1/knime-full:5.6.0-nightly
+
+# Path inside the image where the local update site will be copied
+ARG LOCAL_UPDATE_SITE_PATH=/home/knime/local-update-site
+ARG LOCAL_UPDATE_SITE_SRC
+ENV LOCAL_UPDATE_SITE_SRC=${LOCAL_UPDATE_SITE_SRC}
+
+# Define the list of update sites and features
+# Add the local update site (copied into the image) to the list of update sites via file:// URL
+# Ensure the local update site is present in the build context under ./local-update-site
+ENV KNIME_UPDATE_SITES="file://${LOCAL_UPDATE_SITE_PATH}, https://update.knime.com/community-contributions/trusted/5.6, https://update.knime.com/analytics-platform/nightly/5.6.1"
+
+# Install features from the update sites
+# Allow overriding via build-arg; fallback to a sensible default matching knime.yml (group_id + ".features." + name)
+ARG KNIME_FEATURES_ARG
+ENV KNIME_FEATURES="${KNIME_FEATURES_ARG:-org.tutorial.features.first_extension.feature.group}"
+
+# Install CA Certificates
+USER root
+RUN  apt-get update && \ 
+apt-get install -y ca-certificates chromium-browser && \ 
+update-ca-certificates && \ 
+rm -rf /var/lib/apt/lists/*
+
+USER knime
+
+# Copy the local update site produced by the build into the image so it's available during installation
+# The source folder can be overridden via --build-arg LOCAL_UPDATE_SITE_SRC=...
+COPY --chown=knime:knime ${LOCAL_UPDATE_SITE_SRC} ${LOCAL_UPDATE_SITE_PATH}
+
+# Execute extension installation script
+RUN ./install-extensions.sh
+
+# pre-start executor to improve startup time
+RUN KNIME_EXECUTOR_CONNECTION_RETRIES=0 knime/knime -data /home/knime/knime-workspace -consolelog -nosplash -application com.knime.enterprise.slave.KNIME_REMOTE_APPLICATION; rm -rf /home/knime/knime-workspace
+
+# Copy the demo workflow into the image
+COPY --chown=knime:knime demo/Example_with_Python_node.knwf /home/knime/demo-workflow/
+
+# Run the demo workflow to test the extension
+RUN knime/knime -data /home/knime/test-workspace -consolelog -nosplash -application org.knime.product.KNIME_BATCH_APPLICATION -workflowDir=/home/knime/demo-workflow && rm -rf /home/knime/test-workspace

.github/workflows/run_knime_workflow_test.yml

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+name: 'Run KNIME Workflow Test'
+
+on:
+  workflow_dispatch:
+    inputs:
+      run_build:
+        description: 'Run build job'
+        required: false
+        default: 'true'
+  pull_request:
+    types: [opened, synchronize, reopened]
+    branches: [ master ]
+  push:
+    branches: [ master ]
+
+jobs:
+  build:
+    name: Bundle extension and build image
+    runs-on: ubuntu-latest
+    if: ${{ github.event_name != 'workflow_dispatch' || github.event.inputs.run_build == 'true' }}
+    env:
+      LOCAL_UPDATE_SITE_DIR: local-update-site
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Pixi
+        uses: prefix-dev/setup-pixi@v0
+
+      - name: Install environment
+        run: pixi install
+
+      - name: Build local update site
+        run: pixi run build
+
+      - name: Upload update site artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: extensionartifacts-for-update-site-${{ github.run_id }}
+          path: ${{ env.LOCAL_UPDATE_SITE_DIR }}
+
+      - name: Compute KNIME feature group from knime.yml
+        id: knime_meta
+        shell: bash
+        run: |
+            pixi run -e build python - <<'PY'
+            import os
+            import yaml
+            with open('knime.yml', 'r', encoding='utf-8') as f:
+                y = yaml.safe_load(f)
+            group_id = (y.get('group_id') or '').strip()
+            name = (y.get('name') or '').strip()
+            if not group_id or not name:
+                raise SystemExit(f"Failed to parse group_id/name from knime.yml (group_id={group_id}, name={name})")
+            feature_group_id = f"{group_id}.features.{name}.feature.group"
+            with open(os.environ['GITHUB_OUTPUT'], 'a', encoding='utf-8') as gh:
+                print(f"feature_group_id={feature_group_id}", file=gh)
+            print("Computed feature group:", feature_group_id)
+            PY
+
+      - name: Build KNIME image with local update site
+        run: |
+            docker build \
+                -f .github/workflows/Dockerfile \
+                --build-arg LOCAL_UPDATE_SITE_SRC="${{ env.LOCAL_UPDATE_SITE_DIR }}" \
+                --build-arg KNIME_FEATURES_ARG="${{ steps.knime_meta.outputs.feature_group_id }}" \
+                -t knime-executor-with-extension:ci .