Installing claude code cli in containers 21-03-2026 https://www.datacamp.com/tutorial/claude-code-docker?dc_referrer=https%3A%2F%2Fwww.google.com%2F https://github.com/anthropics/claude-code/blob/main/.devcontainer/Dockerfile https://code.claude.com/docs/en/setup#install-claude-code