Ref:

- https://github.com/static-web-server/static-web-server/releases/tag/v2.40.0
- https://github.com/static-web-server/static-web-server/pull/567
- https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/4767

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/4768

Regression since a451f1fcb1

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/4445

This commit adds copyright attributions in SPDX to the files for matrix-cactus-comments and matrix-cactus-comments-client, following REUSE's specification.

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

`-t` works on both old and new Docker versions, so it's best to use that.

This is split out from matrix-cactus-comments (see 241779b583),
but also heavily inspired by `matrix-static-files`.