Add Docker support for Ormin + BaraDB dev stack

- docker-compose.ormin.yml: BaraDB + Ormin dev environment
- clients/nim/ormin/docker/Dockerfile: dev image with Nim 2.2.10
- clients/nim/ormin/docker/entrypoint.sh: auto-install deps
- docker-compose.test.yml: add Ormin compile test

clients/nim/ormin/docker/entrypoint.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+set -eu
+
+# Ormin + BaraDB Dev Entrypoint
+# Handles dependency installation and optional example compilation.
+
+DEPS_FLAG="/workspace/.deps-installed"
+
+# Install dependencies once
+if [ ! -f "$DEPS_FLAG" ]; then
+    echo "[ormin-dev] Installing BaraDB client..."
+    cd /workspace/baradb
+    nimble install -y
+
+    echo "[ormin-dev] Installing Ormin dependencies..."
+    cd /workspace/ormin
+    nimble install -y
+
+    touch "$DEPS_FLAG"
+    echo "[ormin-dev] Dependencies ready."
+fi
+
+# If no arguments, drop to shell
+if [ $# -eq 0 ]; then
+    exec bash
+fi
+
+# Otherwise run the provided command
+exec "$@"