Add Dockerfile and Docker build instructions

Dockerfile

@@ -0,0 +1,16 @@
+FROM golang:1.22 AS build
+WORKDIR /go/src/github.com/thmshmm/xk6-opentelemetry
+COPY . .
+RUN go install go.k6.io/xk6/cmd/xk6@latest
+RUN xk6 build --with xk6-opentelemetry=. --with github.com/mostafa/xk6-kafka
+
+FROM alpine:latest as base
+RUN apk add --no-cache ca-certificates && \
+  addgroup -S app && adduser -S -G app app
+
+FROM scratch
+COPY --from=base /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=base /etc/passwd /etc/passwd
+COPY --from=build /go/src/github.com/thmshmm/xk6-opentelemetry/k6 /k6
+USER app
+ENTRYPOINT ["/k6"]

README.md

@@ -12,7 +12,23 @@ Check the [examples](./examples/) directory which contains some scripts to get s
     - ExportTraceServiceRequest
 - Set resource attributes
 
-## Development
+## Usage
+
+### Docker
+
+The easiest way to get started is to build the provided Docker image and run k6 scripts inside the container.
+
+Build the image:
+```
+docker build -t xk6-opentelemetry .
+```
+
+Run a local k6 script:
+```
+docker run --rm -i xk6-opentelemetry run - <my-script.js
+```
+
+### Local build
 
 As the testing environment and scripts rely on sending messages to Kafka, the extension [xk6-kafka](https://github.com/mostafa/xk6-kafka) needs to be integrated as well when creating the k6 binary.
 

Taskfile.yml

@@ -5,6 +5,10 @@ tasks:
     cmds:
       - xk6 build --with xk6-opentelemetry=. --with github.com/mostafa/xk6-kafka
 
+  build-docker:
+    cmds:
+      - docker build -t xk6-opentelemetry .
+
   lint:
     cmds:
       - golangci-lint run