Support for Docker & Kubernetes added (#93)

Author: CosminL-DEV

k8s/README.md

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+# Cadence Samples Usage Guide
+
+This guide explains how to build, deploy, and use the Cadence samples container for testing workflows.
+
+## Prerequisites: Domain Registration
+
+Before running any samples, you must first register the domain in Cadence. Execute this command in the cadence-frontend pod:
+
+```bash
+# Access the cadence-frontend pod
+kubectl exec -it <cadence-frontend-pod-name> -n cadence -- /bin/bash
+
+# Register the default domain
+cadence --address $(hostname -i):7833 \
+    --transport grpc \
+    --domain default \
+    domain register \
+    --retention 1
+```
+
+**Note**: Replace `<cadence-frontend-pod-name>` with your actual cadence-frontend pod name and adjust the namespace if needed.
+
+## Building the Docker Image
+
+Build the samples image with your Cadence host configuration:
+
+```bash
+docker build --build-arg CADENCE_HOST="cadence-frontend.cadence.svc.cluster.local:7833" -t cadence-samples:latest .
+```
+
+**Important**: Replace `cadence-frontend.cadence.svc.cluster.local:7833` with your actual Cadence frontend service address.
+
+### Examples for Different Environments
+
+```bash
+# Local development
+docker build --build-arg CADENCE_HOST="localhost:7833" -t cadence-samples:latest -f Dockerfile.samples .
+
+# Kubernetes cluster (same namespace)
+docker build --build-arg CADENCE_HOST="cadence-frontend.cadence.svc.cluster.local:7833" -t cadence-samples:latest .
+
+# Different namespace
+docker build --build-arg CADENCE_HOST="cadence-frontend.my-namespace.svc.cluster.local:7833" -t cadence-samples:latest .
+```
+
+## Upload to Container Registry
+
+Tag and push your image to your container registry:
+
+```bash
+# Tag the image
+docker tag cadence-samples:latest your-registry.com/cadence-samples:latest
+
+# Push to registry
+docker push your-registry.com/cadence-samples:latest
+```
+
+## Kubernetes Deployment
+
+### Pod Configuration
+
+Edit the provided YAML file:
+
+```yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: cadence-samples
+  namespace: cadence # Change to your namespace
+  labels:
+    app: cadence-samples
+spec:
+  containers:
+  - name: cadence-samples
+    image: cadence-samples:latest  # Change to your registry image
+    imagePullPolicy: IfNotPresent
+    command: ["/bin/bash"]
+    args: ["-c", "sleep infinity"]
+    workingDir: /home/cadence
+    env:
+    - name: HOME
+      value: "/home/cadence"
+    resources:
+      requests:
+        memory: "128Mi"
+        cpu: "100m"
+      limits:
+        memory: "1Gi"
+        cpu: "1"
+  restartPolicy: Always
+  securityContext:
+    runAsUser: 1001
+    runAsGroup: 1001
+    fsGroup: 1001
+```
+
+**Required Changes**:
+1. **`namespace`**: Change to your Cadence namespace
+2. **`image`**: Change to your registry image path
+
+### Deploy the Pod
+
+```bash
+kubectl apply -f cadence-samples-pod.yaml
+```
+
+## Using the Samples
+
+### Step 1: Access the Container
+
+```bash
+kubectl exec -it cadence-samples -n cadence -- /bin/bash
+```
+
+### Step 2: Run Workflow Examples
+
+#### Terminal 1 - Start the Worker
+```bash
+# Example: Hello World worker
+./bin/helloworld -m worker
+```
+
+#### Terminal 2 - Trigger the Workflow
+Open a second terminal and execute:
+```bash
+kubectl exec -it cadence-samples -n cadence -- /bin/bash
+./bin/helloworld -m trigger
+```
+
+#### Stop the Worker
+In Terminal 1, press `Ctrl+C` to stop the worker.
+
+### Some Available Sample Commands
+
+```bash
+# Hello World
+./bin/helloworld -m worker
+./bin/helloworld -m trigger
+
+# File Processing
+./bin/fileprocessing -m worker
+./bin/fileprocessing -m trigger
+
+# DSL Example
+./bin/dsl -m worker
+./bin/dsl -m trigger -dslConfig cmd/samples/dsl/workflow1.yaml
+./bin/dsl -m trigger -dslConfig cmd/samples/dsl/workflow2.yaml
+```
+
+## Complete Sample Documentation
+
+For all available samples, detailed explanations, and source code, visit:
+**https://github.com/cadence-workflow/cadence-samples**
+
+This repository contains comprehensive documentation for each sample workflow pattern and advanced usage examples.

k8s/cadence-samples-pod.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  name: cadence-samples
+  namespace: cadence # Replace with your cadence namespace
+  labels:
+    app: cadence-samples
+spec:
+  containers:
+  - name: cadence-samples
+    image: cadence-samples:latest  # Replace with your built image
+    imagePullPolicy: IfNotPresent
+    command: ["/bin/bash"]
+    args: ["-c", "sleep infinity"]
+    workingDir: /home/cadence
+    env:
+    - name: HOME
+      value: "/home/cadence"
+    resources:
+      requests:
+        memory: "128Mi"
+        cpu: "100m"
+      limits:
+        memory: "1Gi"
+        cpu: "1"
+  restartPolicy: Always
+  securityContext:
+    runAsUser: 1001
+    runAsGroup: 1001
+    fsGroup: 1001

k8s/docker/Dockerfile

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+FROM golang:1.21-alpine
+
+# Install all necessary dependencies for building and running
+RUN apk add --no-cache git make gcc musl-dev ca-certificates nano curl bash sed
+
+# Build argument for Cadence host configuration
+ARG CADENCE_HOST=localhost:7833
+
+# Create non-root user
+RUN addgroup -g 1001 cadence && \
+    adduser -D -u 1001 -G cadence cadence
+
+# Set working directory
+WORKDIR /home/cadence
+
+# Clone cadence-samples repository
+RUN git clone https://github.com/cadence-workflow/cadence-samples.git .
+
+# Update config file with the provided Cadence host
+RUN sed -i "s/host: \"localhost:7833\"/host: \"${CADENCE_HOST}\"/" config/development.yaml
+
+# Build all samples
+RUN make
+
+# Change ownership of files
+RUN chown -R cadence:cadence /home/cadence
+
+# Switch to non-root user
+USER cadence
+
+# Default command - interactive shell
+CMD ["/bin/bash"]