Split docker build and test into separate scripts

scripts/docker/test.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+IMAGE="${DOTNET_IMAGE:-mcr.microsoft.com/dotnet/sdk:10.0}"
+
+docker run --rm \
+  -v "${ROOT_DIR}:/workspace" \
+  -w /workspace \
+  "${IMAGE}" \
+  bash -lc "
+    set -euo pipefail
+    dotnet test DynamORM.Tests/DynamORM.Tests.csproj -c Release
+  "
+