Add dev container config

Author: adamw

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/devcontainers/java:25
+
+# Install essential tools
+RUN apt-get update && \
+    apt-get install -y vim curl wget git jq && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+# Install sbt
+RUN curl -fL "https://github.com/sbt/sbt/releases/download/v1.12.0/sbt-1.12.0.tgz" | tar xz -C /tmp && \
+    mv /tmp/sbt/bin/sbt /usr/local/bin/ && \
+    mv /tmp/sbt/bin/sbt-launch.jar /usr/local/bin/ && \
+    chmod +x /usr/local/bin/sbt && \
+    rm -rf /tmp/sbt

.devcontainer/devcontainer.json

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+{
+    "name": "tapir",
+    "build": {
+        "dockerfile": "Dockerfile"
+    },
+    "features": {
+        "ghcr.io/devcontainers/features/node:1": {
+            "version": "24"
+        },
+        "ghcr.io/anthropics/devcontainer-features/claude-code:1.0": {},
+        "ghcr.io/devcontainers/features/github-cli:1": {
+            "installDirectlyFromGitHubRelease": true,
+            "version": "latest"
+        }
+    },
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "anthropic.claude-code",
+                "scalameta.metals",
+                "scala-lang.scala",
+                "github.vscode-pull-request-github"
+            ],
+            "settings": {
+                "terminal.integrated.defaultProfile.linux": "bash",
+                "claudeCode.allowDangerouslySkipPermissions": true,
+                "claudeCode.initialPermissionMode": "bypassPermissions",
+                "claudeCode.selectedModel": "opus"
+            }
+        }
+    },
+    "postCreateCommand": "bash .devcontainer/post-create.sh",
+    "postStartCommand": "bash .devcontainer/post-start.sh",
+    "mounts": [
+        "type=volume,source=tapir-vscode-home,target=/home/vscode",
+        "type=bind,source=${localEnv:HOME}/.claude/CLAUDE.md,target=/home/vscode/.claude/CLAUDE.md,readonly",
+        "type=bind,source=${localEnv:HOME}/.claude/commands,target=/home/vscode/.claude/commands,readonly",
+        "type=bind,source=${localEnv:HOME}/.claude/agents,target=/home/vscode/.claude/agents,readonly"
+    ],
+    "containerEnv": {
+        "SSH_AUTH_SOCK": ""
+    },
+    "runArgs": [
+        "--env-file=${localWorkspaceFolder}/../dev-container-oss.env"
+    ]
+}

.devcontainer/post-create.sh

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+#!/bin/bash
+set -e
+
+echo "Running post-create setup..."
+
+# Override git config with environment variables if provided
+if [ -n "$GIT_USER_NAME" ]; then
+  git config --global user.name "$GIT_USER_NAME"
+fi
+if [ -n "$GIT_USER_EMAIL" ]; then
+  git config --global user.email "$GIT_USER_EMAIL"
+fi
+
+# Add claude-yolo alias
+echo 'alias claude-yolo="claude --dangerously-skip-permissions"' >> ~/.bashrc
+
+# Ensure mounted directories exist & fix ownership (Docker volumes are created as root)
+mkdir -p /home/vscode/.claude
+sudo chown -R vscode:vscode /home/vscode/.claude 2>/dev/null || true
+
+echo "Post-create setup complete."

.devcontainer/post-start.sh

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+#!/bin/bash
+set -e
+
+sudo env PATH="$PATH" claude update