docker: Add hello world workflow sample with k8s config

Add containerized hello world workflow with Dockerfile and k8s deployment manifest.

Signed-off-by: Diana Zawadzki <[email protected]>

Author: zawadzkidiana

docker/.devcontainer/Dockerfile

@@ -0,0 +1,30 @@
+FROM mcr.microsoft.com/devcontainers/go:1.23
+
+# Install additional tools
+RUN apt-get update && apt-get install -y \
+    git \
+    make \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set up workspace
+WORKDIR /workspace
+
+# Install Go tools
+RUN go install golang.org/x/tools/gopls@latest \
+    && go install github.com/go-delve/delve/cmd/dlv@latest
+
+# Create non-root user
+ARG USERNAME=vscode
+ARG USER_UID=1000
+ARG USER_GID=$USER_UID
+
+RUN groupadd --gid $USER_GID $USERNAME \
+    && useradd --uid $USER_UID --gid $USER_GID -m $USERNAME \
+    && apt-get update \
+    && apt-get install -y sudo \
+    && echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME \
+    && chmod 0440 /etc/sudoers.d/$USERNAME
+
+# Set the default user
+USER $USERNAME

docker/.devcontainer/devcontainer.json

@@ -0,0 +1,28 @@
+{
+    "name": "Go Development Container",
+    "dockerFile": "Dockerfile",
+    "runArgs": [
+        "--cap-add=SYS_PTRACE",
+        "--security-opt", "seccomp=unconfined"
+    ],
+    "customizations": {
+        "vscode": {
+            "settings": {
+                "go.toolsManagement.checkForUpdates": "local",
+                "go.useLanguageServer": true,
+                "go.gopath": "/go"
+            },
+            "extensions": [
+                "golang.go",
+                "ms-azuretools.vscode-docker"
+            ]
+        }
+    },
+    "remoteUser": "vscode",
+    "features": {
+        "docker-in-docker": {
+            "version": "latest",
+            "moby": true
+        }
+    }
+}

docker/Dockerfile

@@ -0,0 +1,20 @@
+# Start from a Go base image
+FROM golang:1.21-alpine
+
+# Set the working directory inside the container
+WORKDIR /app
+
+# Copy go.mod and go.sum files
+COPY go.mod go.sum ./
+
+# Download all dependencies
+RUN go mod download
+
+# Copy the source code into the container
+COPY . .
+
+# Build the application
+RUN go build -o /samples ./...
+
+# Command to run when starting the container
+CMD ["/samples"]

docker/build.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# Default values
+DOCKER_REGISTRY=${DOCKER_REGISTRY:-"docker.io/your-username"}
+TAG=${TAG:-"latest"}
+
+# Build the Docker image
+echo "Building Docker image..."
+docker build -t ${DOCKER_REGISTRY}/cadence-helloworld-worker:${TAG} -f docker/docker/Dockerfile .
+
+# Push the image if requested
+if [ "$1" == "push" ]; then
+    echo "Pushing Docker image to registry..."
+    docker push ${DOCKER_REGISTRY}/cadence-helloworld-worker:${TAG}
+fi

docker/docker/Dockerfile

@@ -0,0 +1,32 @@
+# Build stage
+FROM golang:1.21-alpine AS builder
+
+# Set working directory
+WORKDIR /app
+
+# Copy source code
+COPY hello-world/main.go .
+
+# Build the binary
+RUN CGO_ENABLED=0 GOOS=linux go build -o /hello-world main.go
+
+# Final stage
+FROM alpine:3.18
+
+# Copy the binary from builder
+COPY --from=builder /hello-world /usr/local/bin/
+
+# Set the binary as the entrypoint
+ENTRYPOINT ["hello-world"]
+
+# Install necessary runtime dependencies
+RUN apk --no-cache add ca-certificates tzdata
+
+# Copy the built executable
+COPY --from=builder /samples/hello-world /app/hello-world
+
+# Set working directory
+WORKDIR /app
+
+# Command to run the sample
+ENTRYPOINT ["/app/hello-world"]

docker/docker/README.md

@@ -0,0 +1,39 @@
+# Dockerized Cadence Samples
+
+## Overview
+This project adds Docker support to Cadence samples, making them easier to deploy in containerized environments like Kubernetes.
+
+## Why Dockerize?
+- Enable easy deployment to cloud environments
+- Ensure consistent runtime environment
+- Simplify the getting started experience
+- Support Kubernetes deployment scenarios
+
+## Directory Structure
+```
+samples/docker/
+├── Dockerfile              # Main Dockerfile for samples
+├── docker-compose.yml      # Local development setup
+└── k8s/                   # Kubernetes deployment files
+```
+
+## Getting Started
+1. Build the Docker image:
+   ```bash
+   docker build -t cadence-samples .
+   ```
+
+2. Run using Docker Compose:
+   ```bash
+   docker-compose up
+   ```
+
+## Testing
+- Unit tests: `make test`
+- Integration tests: `make integration-test`
+- Manual verification steps in [TESTING.md](TESTING.md)
+
+## What's Next?
+- [ ] Add Kubernetes Helm charts
+- [ ] Add CI/CD pipeline for automated builds
+- [ ] Add more sample workflows

docker/docker/go.mod

@@ -0,0 +1,57 @@
+module github.com/uber/cadence/samples/hello-world
+
+go 1.25.2
+
+require (
+	go.uber.org/cadence v1.3.0
+	go.uber.org/zap v1.27.0
+)
+
+require (
+	github.com/BurntSushi/toml v0.4.1 // indirect
+	github.com/apache/thrift v0.16.0 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.1 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/facebookgo/clock v0.0.0-20150410010913-600d898af40a // indirect
+	github.com/golang-jwt/jwt/v5 v5.2.0 // indirect
+	github.com/golang/mock v1.5.0 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/jonboulle/clockwork v0.4.0 // indirect
+	github.com/marusama/semaphore/v2 v2.5.0 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369 // indirect
+	github.com/opentracing/opentracing-go v1.1.0 // indirect
+	github.com/pborman/uuid v0.0.0-20160209185913-a97ce2ca70fa // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/prometheus/client_golang v1.11.1 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.26.0 // indirect
+	github.com/prometheus/procfs v0.6.0 // indirect
+	github.com/robfig/cron v1.2.0 // indirect
+	github.com/stretchr/objx v0.5.2 // indirect
+	github.com/stretchr/testify v1.9.0 // indirect
+	github.com/uber-go/tally v3.3.15+incompatible // indirect
+	github.com/uber/tchannel-go v1.32.1 // indirect
+	go.uber.org/atomic v1.11.0 // indirect
+	go.uber.org/multierr v1.10.0 // indirect
+	go.uber.org/net/metrics v1.3.0 // indirect
+	go.uber.org/thriftrw v1.25.0 // indirect
+	go.uber.org/yarpc v1.55.0 // indirect
+	golang.org/x/exp/typeparams v0.0.0-20220218215828-6cf2b201936e // indirect
+	golang.org/x/lint v0.0.0-20200130185559-910be7a94367 // indirect
+	golang.org/x/mod v0.8.0 // indirect
+	golang.org/x/net v0.19.0 // indirect
+	golang.org/x/oauth2 v0.1.0 // indirect
+	golang.org/x/sys v0.15.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	golang.org/x/time v0.0.0-20170927054726-6dc17368e09b // indirect
+	golang.org/x/tools v0.6.0 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/genproto v0.0.0-20200212174721-66ed5ce911ce // indirect
+	google.golang.org/grpc v1.28.0 // indirect
+	google.golang.org/protobuf v1.31.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	honnef.co/go/tools v0.3.2 // indirect
+)
+
+replace github.com/uber/cadence => ../..