ipabusedb-docker-reporter: rename from ipabusedb-docker-ssh, add Dockerfile with runit service

Build on git.eeqj.de/sneak/baseimage:2026-11-05 with the docker CLI
copied from docker:cli. A runit service sleeps INTERVAL seconds
(default 1200), then runs the reporter with --since INTERVAL --submit;
DOCKER_CONTAINER_NAME and IPABUSEDB_API_KEY come from the container
environment. Add .dockerignore, make image, and README section; fix the
binary name in .gitignore.

ipabusedb-docker-reporter/.env.example

@@ -0,0 +1,5 @@
+# Copy to .env (gitignored). Variables already set in your shell win.
+IPABUSEDB_API_KEY=
+DOCKER_CONTAINER_NAME=sshd
+# Point the docker CLI at a remote daemon; credentials above stay local.
+DOCKER_HOST=ssh://user@sshd-host.example.com