Add devcontainer configuration

Co-authored-by: Ona <no-reply@ona.com>

.devcontainer/Dockerfile

@@ -0,0 +1,5 @@
+FROM mcr.microsoft.com/devcontainers/base:ubuntu-24.04
+
+# use this Dockerfile to install additional tools you might need, e.g.
+# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+#     && apt-get -y install --no-install-recommends <your-package-list-here>

.devcontainer/devcontainer.json

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+// The Dev Container format allows you to configure your environment. At the heart of it
+// is a Docker image or Dockerfile which controls the tools available in your environment.
+//
+// See https://aka.ms/devcontainer.json for more information.
+{
+	"name": "Ona",
+	// Use "image": "mcr.microsoft.com/devcontainers/base:ubuntu-24.04",
+	// instead of the build to use a pre-built image.
+	"build": {
+        "context": ".",
+        "dockerfile": "Dockerfile"
+    }
+	// Features add additional features to your environment. See https://containers.dev/features
+	// Beware: features are not supported on all platforms and may have unintended side-effects.
+	// "features": {
+    //   "ghcr.io/devcontainers/features/docker-in-docker": {
+    //     "moby": false
+    //   }
+    // }
+}