feat(docker): add OAUTH_USE_BASIC_AUTH env (#7474)

Makes the last `initOAuth` variable configurable via environment
variables in the swagger-ui docker image.

Co-authored-by: Christopher Giroir <chrisgiroir@improbable.io>
Co-authored-by: Tim Lai <timothy.lai@gmail.com>

dev-helpers/index.html

@@ -59,6 +59,7 @@
         scopeSeparator: " ",
         scopes: "openid profile email phone address",
         additionalQueryStringParams: {},
+        useBasicAuthenticationWithAccessCodeGrant: false,
         usePkceWithAuthorizationCodeGrant: false
       })
     }