docs(run-groups): add code sample and update concepts

docs/docs/concepts/run-groups.mdx

@@ -50,7 +50,7 @@ Last, but not least important, if multiple tests are run inside a run group, the
 ## Using Run Groups from the CLI
 
 :::note
-[Check out the sample code on GitHub here.](https://github.com/kubeshop/tracetest/tree/main/examples/environment-automation)
+[Check out the sample code on GitHub here.](https://github.com/kubeshop/tracetest/tree/main/examples/tracetest-run-groups-cli)
 :::
 
 You can run multiple tests at once by providing multiple `-f file.yaml` parameters to the `tracetest run test` command. These tests will be placed under the same run group.

examples/tracetest-run-groups-cli/.env.template

@@ -0,0 +1,6 @@
+# GRPC
+OTEL_EXPORTER_OTLP_TRACES_ENDPOINT="http://tracetest-agent:4317/"
+# or, use HTTP
+# OTEL_EXPORTER_OTLP_TRACES_ENDPOINT="http://tracetest-agent:4318/v1/traces"
+TRACETEST_API_KEY="<YOUR_TRACETEST_API_KEY>"
+TRACETEST_API_TOKEN="<YOUR_TRACETEST_TOKEN>"

examples/tracetest-run-groups-cli/.gitignore

@@ -0,0 +1,3 @@
+node_modules
+.DS_Store
+.env

examples/tracetest-run-groups-cli/Dockerfile

@@ -0,0 +1,7 @@
+FROM node:slim
+WORKDIR /usr/src/app
+COPY package*.json ./
+RUN npm install
+COPY . .
+EXPOSE 8080
+CMD [ "npm", "run", "with-grpc-tracer" ]

examples/tracetest-run-groups-cli/app.js

@@ -0,0 +1,10 @@
+const express = require("express")
+const app = express()
+app.get("/", (req, res) => {
+  setTimeout(() => {
+    res.send("Hello World")
+  }, 1000);
+})
+app.listen(8080, () => {
+  console.log(`Listening for requests on http://localhost:8080`)
+})

examples/tracetest-run-groups-cli/docker-compose.yaml

@@ -0,0 +1,23 @@
+version: '3'
+services:
+  app:
+    image: tracetest-run-groups
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
+    build: .
+    ports:
+      - "8080:8080"
+    environment:
+      - OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=${OTEL_EXPORTER_OTLP_TRACES_ENDPOINT}
+
+  # Cloud-based Managed Tracetest
+  tracetest-agent:
+    image: kubeshop/tracetest-agent:latest
+    command:
+      - "--mode=verbose"
+    environment:
+      # Find the Agent API Key here: https://docs.tracetest.io/configuration/agent
+      - TRACETEST_API_KEY=${TRACETEST_API_KEY}
+    ports:
+      - 4317:4317
+      - 4318:4318