add devpod integration

.devcontainer/Dockerfile

@@ -0,0 +1,13 @@
+FROM mcr.microsoft.com/devcontainers/go:1-1.21
+
+ARG TARGETOS
+ARG TARGETARCH
+
+# install nats
+ARG NATS_VERSION=2.10.9
+RUN curl -L https://github.com/nats-io/nats-server/releases/download/v${NATS_VERSION}/nats-server-v${NATS_VERSION}-${TARGETOS}-${TARGETARCH}.zip -o nats-server.zip
+RUN unzip nats-server.zip -d nats-server && cp nats-server/nats-server-v${NATS_VERSION}-${TARGETOS}-${TARGETARCH}/nats-server /usr/bin
+
+# install nats-cli
+RUN curl -sf https://binaries.nats.dev/nats-io/natscli/nats@latest | sh && cp nats /usr/bin
+

.devcontainer/devcontainer.json

@@ -0,0 +1,18 @@
+{
+  "name": "Go",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "features": {
+    "ghcr.io/devcontainers/features/docker-in-docker:2": {
+      "version": "latest"
+    }
+  },
+  "mounts": [
+    {
+      "type": "volume",
+      "source": "devpod",
+      "target": "/home/vscode"
+    }
+  ]
+}

README.md

@@ -3,6 +3,8 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/claudiunicolaa/natsdedup)](https://goreportcard.com/report/github.com/claudiunicolaa/natsdedup)
 [![Run natsdedup tests](https://github.com/claudiunicolaa/natsdedup/actions/workflows/tests.yml/badge.svg?branch=main)](https://github.com/claudiunicolaa/natsdedup/actions/workflows/tests.yml)
 
+[![Open in DevPod!](https://devpod.sh/assets/open-in-devpod.svg)](https://devpod.sh/open#https://github.com/claudiunicolaa/natsdedup)
+
 `natsdedup` is a lightweight package for deduplicating messages on NATS subjects. 
 It listens to messages on a specified input subject, deduplicates them using a configurable time-to-live (TTL) cache, and forwards unique messages to a specified output subject.