Initial commit of plugin with local Kafka details

plugins/ca-kafka-local/README.md

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+# CA Kafka Local Devbox Plugin
+
+At Culture Amp we use Kafka for sharing data between services, and the private [kafka-local](https://github.com/cultureamp/kafka-local) repo is how we run that locally.
+
+This plugin is added to other services to allow you to interact with `kafka-local` for your service. You still need to launch Kafka on your own, but this plugin provides environment variables and tools to make it easy for your project to connect to `kafka-local`.
+
+What it provides:
+
+- Environment variables
+  - `KAFKA_BROKERS` set to `"localhost:14231"`
+  - `SCHEMA_REGISTRY_URL` set to `"localhost:14228"`
+- Process Compose job
+  - Will print information to the terminal about Kafka, once `kafka-local` is up and running.
+  - Allows you to add a `depends_on` clause so other services wait for `kafka-local`.
+
+## Usage
+
+To start Kafka
+
+- Use [Hotel CLI](https://github.com/cultureamp/hotel)
+- Run `hotel services up kafka`
+- In your repo run `devbox services up`
+
+Include the plugin in your `devbox.json`:
+
+    {
+      "$schema": "https://raw.githubusercontent.com/jetify-com/devbox/main/.schema/devbox.schema.json",
+      "include": [
+        "github:cultureamp/devbox-extras?dir=plugins/ca-kafka-local"
+      ]
+    }
+
+You can have another service depend on Kafka in your `process-compose.yaml`:
+
+    projectors_process:
+      command: "./gradlew run-projectors"
+      depends_on:
+        kafka_local:
+          condition: process_healthy

plugins/ca-kafka-local/bin/kafka-local-readme

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+#!/bin/sh
+
+set -e
+
+echo
+echo "== LOCAL KAFKA =="
+echo "To start Kafka Local (https://github.com/cultureamp/kafka-local):"
+echo "  hotel services up kafka"
+echo
+echo "Once all Kafka services are up and running, this step will be considered healthy"
+echo
+echo "== Environment variables =="
+echo "KAFKA_BROKERS: ${KAFKA_BROKERS}"
+echo "SCHEMA_REGISTRY_URL: ${SCHEMA_REGISTRY_URL}"
+echo

plugins/ca-kafka-local/plugin.json

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+{
+  "name": "ca-kafka-local",
+  "version": "0.0.1",
+  "readme": "README.md",
+  "env": {
+    "KAFKA_BROKERS": "localhost:14231",
+    "SCHEMA_REGISTRY_URL": "localhost:14228"
+  },
+  "create_files": {
+    "{{.Virtenv}}/bin/kafka-local-readme": "bin/kafka-local-readme",
+    "{{ .Virtenv }}/process-compose.yaml": "./process-compose.yaml"
+  },
+  "shell": {
+    "scripts": {
+      "kafka-local-readme": "{{.Virtenv}}/bin/kafka-local-readme"
+    }
+  }
+}

plugins/ca-kafka-local/process-compose.yaml

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+version: "0.5"
+
+processes:
+  kafka_local:
+    # This doesn't actually start Local Kafka, but it prints information about Kafka running, and allows you to do `depends_on: kafka_local`
+    command: "devbox run kafka-local-readme; tail -f /dev/null"
+    readiness_probe:
+      # This ensures kafka-ui is up and running, which means Kafka and Schema Registry are up and healthy.
+      # The ports are static and defined in our `local-ops` repo, and it's safe to assume it won't change.
+      http_get:
+        host: localhost
+        port: 12288
+      failure_threshold: 999
+    availability:
+      restart: always