Fix Docker build and improve checks #220

This commit improves multiple aspects of Docker builds:

- Enable artifact output validation for Dockerfile.
- Correct the path references in Dockerfile for the distribution
  directory.
- Add Dockerfile specific indentation rules to `.editorconfig`.
- Use `npm run install-deps` for dependency installation, enhancing
  build reliability.
- Add automation script `verify-web-server-status.js` to verify running
  web server on given URL.
- Introduce automated build verification for Dockerfile:
  - On macOS, install Docker with colima as the container runtime
    because default agents do not include Docker and Docker runtime is
    not installed due to licensing issues (see actions/runner-images#17).
  - On Windows, there's no Linux container support (actions/runner#904,
    actions/runner-images#1143), so keep the checks for macOS and Ubuntu
    only.

.editorconfig

@@ -5,3 +5,7 @@ end_of_line = lf
 trim_trailing_whitespace = true
 insert_final_newline = true
 max_line_length = 100
+
+[{Dockerfile}]
+indent_style = space
+indent_size = 4