Add devcontainer

.devcontainer/Dockerfile

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+FROM ubuntu:24.04 AS spython-base
+RUN export DEBIAN_FRONTEND=noninteractive
+RUN apt-get update
+RUN apt-get install -y --no-install-recommends git
+RUN apt-get install -y --no-install-recommends python3
+RUN apt-get install -y --no-install-recommends python3.12-venv python3-pip
+RUN apt-get install -y --no-install-recommends build-essential
+RUN apt-get install -y --no-install-recommends ruby ruby-dev
+RUN apt-get install -y --no-install-recommends bundler
+RUN apt-get install -y --no-install-recommends nodejs
+RUN apt-get install -y --no-install-recommends npm
+RUN apt-get install -y --no-install-recommends ditaa
+RUN apt-get clean autoclean
+RUN apt-get autoremove -y
+RUN rm -rf /var/lib/{apt, dpkg, cache, log}

.devcontainer/devcontainer.json

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+{
+  "name": "RISC-V UnifiedDB Dev",
+  "build": { "dockerfile": "Dockerfile" },
+  "updateContentCommand": "${containerWorkspaceFolder}/.devcontainer/updateContentCommand.sh",
+  "onCreateCommand": "${containerWorkspaceFolder}/.devcontainer/onCreateCommand.sh",
+  "remoteEnv": {
+    "DISPLAY": ":0"
+  },
+  // vscode extensions
+  "customizations": {
+    "vscode": {
+      "settings": {
+        "solargraph.bundlerPath": "bundle",
+        "solargraph.useBundler": true,
+        "files.exclude": {
+          "**/.home": true,
+          "**/.yardoc": true
+        },
+        "files.watcherExclude": {
+          "**/.home": true
+        },
+        "asciidoc.antora.showEnableAntoraPrompt": true
+      },
+      "extensions": [
+        "castwide.solargraph",
+        "redhat.vscode-yaml",
+        "asciidoctor.asciidoctor-vscode",
+        "zhwu95.riscv",
+        "tomoki1207.pdf",
+        "CraigMaslowski.erb"
+      ]
+    }
+  },
+  "forwardPorts": [
+    8000, 8080
+  ]
+}

.devcontainer/onCreateCommand.sh

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+#!/bin/bash
+
+npm i 
+bundle install

.devcontainer/updateContentCommand.sh

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+#!/bin/bash
+
+bundle