ci/cd: Fix macOS Docker build reliability issues

This commit addresses intermittent failures in macOS Docker builds
within the GitHub Actions environment, attributed to slow agent
responses. By adjusting the retry logic, it aims to reduce build
failures caused by delayed Docker service readiness.

The enhancements increase the robustness and clarity of the build
process, especially for macOS, while maintaining functionality across
other operating systems.

Key changes:

- Increase max retries for the server check script from 30 to 90 for
  macOS, accommodating slower startup times.
- Refine retry logic to prevent unnecessary retries after receiving a
  definitive HTTP status code, enabling faster feedback and efficient
  failure handling.

Other supporting changes:

- Introduce a `--max-retries` parameter in the server status check
  script for dynamic adjustment based on the operating system.
- Add emojis to log messages to enhance the visibility of request
  attempts in logs.
- Shift from `http.get` to the `fetch` API for server status checks,
  utilizing its modern syntax, standardization, enriched feature set,
  and better error handling.
- Standardize error output to `stderr`.
- Add a Node.js shebang in the server check script to improve usability.

.github/workflows/checks.build.yaml

@@ -97,4 +97,7 @@ jobs:
         run: docker run -d -p 8080:80 --rm --name privacy.sexy undergroundwires/privacy.sexy:latest
       -
         name: Check server is up and returns HTTP 200
-        run: node ./scripts/verify-web-server-status.js --url http://localhost:8080
+        run: >-
+          node ./scripts/verify-web-server-status.js \
+            --url http://localhost:8080  \
+            --max-retries ${{ matrix.os == 'macos' && '90' || '30' }}