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`.
241779b583