Initial scaffold: Debian-based opencode v1.4.0 dev container

Dockerfile with Node.js 22, git, ssh, fzf, ripgrep, fd, non-root user.
Entrypoint auto-configures provider from env vars.
docker-compose with workspace mount, SSH keys, and persistent data volume.

.env.example

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+# opencode-devbox environment configuration
+# Copy this file to .env and fill in your values:
+#   cp .env.example .env
+
+# ── LLM Provider ─────────────────────────────────────────────────────
+# Which provider to auto-configure (anthropic, openai, amazon-bedrock)
+OPENCODE_PROVIDER=anthropic
+
+# Model override (optional, defaults per provider)
+# OPENCODE_MODEL=anthropic/claude-sonnet-4-5
+
+# ── API Keys (set the one matching your provider) ────────────────────
+ANTHROPIC_API_KEY=
+# OPENAI_API_KEY=
+# GEMINI_API_KEY=
+
+# ── AWS Bedrock (if using amazon-bedrock provider) ───────────────────
+# AWS_REGION=eu-west-1
+# AWS_PROFILE=default
+# AWS_ACCESS_KEY_ID=
+# AWS_SECRET_ACCESS_KEY=
+
+# ── Git Configuration ────────────────────────────────────────────────
+GIT_USER_NAME=
+GIT_USER_EMAIL=
+
+# ── Workspace ────────────────────────────────────────────────────────
+# Path on host to mount as /workspace in the container
+WORKSPACE_PATH=~/projects
+
+# Path to SSH keys on host
+SSH_KEY_PATH=~/.ssh