When send_storage_backend=s3 the role previously deployed the container
with whatever was in send_s3_* (often empty strings from the defaults).
The container would then start, accept uploads, and fail to persist
anything silently. Same pattern as the validate blocks in coturn,
talk, bookstack and opnform: fail fast at task time with a clear error
that points at the four missing variables.
Skipped entirely when send_storage_backend=local (the default).
* tasks/main.yml: prefix all builtin modules with ansible.builtin
(file, template) — silences ansible-lint fqcn[action-core] and
matches the convention used by the other roles in this collection.
* meta/main.yml: change min_ansible_version from the float 2.14 to
the string '2.14'. ansible-galaxy's schema requires a string here
(ansible-lint schema[meta] complains otherwise — same fix I just
applied to the opnform role).
Deploys timvisee/send with a Redis backend behind Traefik. Supports
local-disk or S3 storage (e.g. via the garage role). Uses the shared
`*_domains` list convention so the router can accept internal *.int.*
names alongside the canonical BASE_URL host.
