Add langflow runtime chart

ragstack/charts/langflow-runtime/README.md

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+# LangFlow runtime chart
+
+Deploy LangFlow flows to Kubernetes with this Helm chart.
+
+## Import a flow
+
+There are two ways to import a flow:
+
+1. **From a remote location**: You can reference a flow stored in a remote location, such as a URL or a Git repository by customizing the `values.yaml` file in the section `downloadFlows`:
+
+```yaml
+downloadFlows:
+  flows:
+    - url: https://raw.githubusercontent.com/langflow-ai/langflow/dev/tests/data/BasicChatwithPromptandHistory.json
+#      basicAuth: "myuser:mypassword"
+#      headers:
+#        Authorization: "Bearer my-key"
+```
+
+2. **Packaging the flow as docker image**: You can add a flow from to a docker image based on Langflow runtime and refer to it in the chart.
+   See an example in the `apps` directory.
+
+## Deploy the flow
+
+```
+helm install langflow ./langflow-runtime \
+    --set "downloadFlows.flows[0].uuid=4ca07770-c0e4-487c-ad42-77c6039ce02e" \
+    --set "downloadFlows.flows[0].url=https://raw.githubusercontent.com/nicoloboschi/langflow-flows/main/openai.json" \
+    --set replicaCount=1
+
+kubectl port-forward svc/langflow-langflow-runtime 7860:7860
+
+curl -X POST \
+    "http://localhost:7860/api/v1/run/4ca07770-c0e4-487c-ad42-77c6039ce02e?stream=false" \
+    -H 'Content-Type: application/json'\
+    -d '{"input_value": "message",
+    "output_type": "chat",
+    "input_type": "chat",
+    "tweaks": {
+  "ChatInput-1BPcY": {},
+  "ChatOutput-J1bsS": {}
+}}'
+
+```

ragstack/charts/langflow-runtime/examples/just-chat/Dockerfile

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+FROM ghcr.io/datastax/ragstack-ai-langflow-backend:0.0.8
+RUN mkdir /app/flows
+COPY ./*json /app/flows/.
+ENV LANGFLOW_LOAD_FLOWS_PATH=/app/flows

ragstack/charts/langflow-runtime/examples/just-chat/README.md

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+# Package the flow as docker image
+
+You can package the flow as a docker image and refer to it in the chart.
+
+```
+docker build -t langflow-just-chat .
+```
+
+Then refer to this image in the `values.yaml`:
+
+```yaml
+image:
+  repository: langflow-just-chat
+  tag: latest
+```