Pasture: Owncast 0.3.0

Owncast joins the pasture with federation turned on through its admin API; scenarios/owncast.sh has alice follow the
stream, receive its admin's message, like and boost it (both show in Owncast's admin), and unfollow: 13 checks, with
no change to PrivaPub.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

CLAUDE.md

@@ -561,6 +561,9 @@ tools/pasture/run.sh down                                            # removes e
   checks.
 - **Pins (`scenarios/pins.sh`, needs mastodon):** a Mastodon account pins and unpins while alice follows it, alice pins
   and unpins while it follows her, and a fresh account's earlier pin shows once PrivaPub resolves it. 8 checks.
+- **Owncast (0.3.0):** its image, its data in the `pasture-owncast` volume, federation turned on through its admin
+  API (`owncast_admin`, its default admin / abc123) with the server's address and the actor's name.
+  `scenarios/owncast.sh`, 13 checks.
 - **WriteFreely (0.17.2):** built from its release tarball with `openssl` beside it (`images/writefreely`, it makes
   each blog's keys with the command), on SQLite in the `pasture-writefreely` volume, which the scenario reads from the
   host. wfuser and its blog come from its CLI; its API takes a login. `scenarios/writefreely.sh`, 13 checks.