Add VAPIX access example

In `Cargo.toml`:
- Disable default features for `reqwest` because by default it tries to
  build HTTPS support which fails, and HTTPS is not needed when
  accessing VAPIX locally, even when "Allow access through" is set to
  only "HTTPS".

.github/workflows/CI.yml

@@ -18,3 +18,4 @@ jobs:
           make --always-make check_all
           PACKAGE=licensekey_handler make build
           PACKAGE=embedded_web_page make build
+          PACKAGE=vapix_access make build