T9: the pasture as plugins

tools/pasture/run.sh up [peer...] | down | logs | ps and interop.sh [peer...] are now built
from parts:
- lib/pasture.sh: network, Caddy with its CA in a volume and copied to .ca/root.crt, Mongo,
  PrivaPub;
- peers/<name>.sh: each peer's <name>_up;
- lib/interop.sh: ok, ko, and xf for checks expected to fail until a later phase;
  privapub_token <persona>, which gives each peer its own persona under one root; and
  stats_check;
- scenarios/<name>.sh: each peer's checks.

GoToSocial is pinned at 0.22.1, the version the 33 checks were proven on. Its scenario
gains four statistics checks:
- the admin statistics describe gts.test as gotosocial;
- they count inbound and outbound traffic;
- they name no account.

37/37 passed three runs in a row.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ELjqpznMFMNrJoJUj6K5p2

tools/pasture/peers/gts.sh

@@ -0,0 +1,18 @@
+# GoToSocial: sqlite, told to accept Caddy's certificate and to reach private addresses.
+GTS_IMAGE=docker.io/superseriousbusiness/gotosocial:0.22.1
+
+gts_up() {
+	podman run -d --replace --name pasture-gts --network $net -p 127.0.0.1:6972:80 \
+		--sysctl net.ipv4.ip_unprivileged_port_start=0 \
+		-e GTS_HOST=gts.test -e GTS_PROTOCOL=https -e GTS_PORT=80 -e GTS_BIND_ADDRESS=0.0.0.0 -e GTS_HTTP_CLIENT_TLS_INSECURE_SKIP_VERIFY=true \
+		-e GTS_DB_TYPE=sqlite -e GTS_DB_ADDRESS=/gotosocial/storage/sqlite.db -e GTS_STORAGE_LOCAL_BASE_PATH=/gotosocial/storage \
+		-e GTS_LETSENCRYPT_ENABLED=false -e GTS_HTTP_CLIENT_ALLOW_IPS=10.0.0.0/8,172.16.0.0/12,192.168.0.0/16 \
+		-e GTS_TRUSTED_PROXIES=0.0.0.0/0 -e GTS_LOG_LEVEL=info -e GTS_INSTANCE_EXPOSE_PUBLIC_TIMELINE=true \
+		$GTS_IMAGE >/dev/null
+	wait_http http://127.0.0.1:6972/api/v1/instance
+	podman exec pasture-gts /gotosocial/gotosocial admin account create --username gtsuser --email gtsuser@gts.test --password 'Gts-Pasture-Pass-1!' >/dev/null 2>&1 || true
+	podman exec pasture-gts /gotosocial/gotosocial admin account confirm --username gtsuser >/dev/null 2>&1 || true
+	podman restart pasture-gts >/dev/null
+	wait_http http://127.0.0.1:6972/api/v1/instance
+	echo "gotosocial: https://gts.test:6443"
+}