Adding dev container to work with project safely.

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/javascript-node
+{
+  "name": "sql-ts",
+  // Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+  "image": "mcr.microsoft.com/devcontainers/javascript-node:4-20-bookworm",
+
+  // Features to add to the dev container. More info: https://containers.dev/features.
+  "features": {
+    // Needed for test containers
+    "ghcr.io/devcontainers/features/docker-in-docker:2": {
+      "moby": true,
+      "installDockerComposeSwitch": true
+    }
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": ["esbenp.prettier-vscode", "github.vscode-github-actions"]
+    }
+  },
+
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  // "forwardPorts": [],
+
+  "postCreateCommand": "npm install"
+
+  // Configure tool-specific properties.
+  // "customizations": {},
+
+  // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+  // "remoteUser": "root"
+}