feat(federation): add scenario-mastodon setup and teardown (#1274)

2/5 taken out of #1269

This patch adds the setup and teardown of Mastodon for use in the end-to-end tests

Co-Authored-By: zam <mirco.zachmann@meissa.de>
Co-Authored-By: erik <erik.seiert@meissa-gmbh.de>
Co-Authored-By: Michael Jerger <michael.jerger@meissa-gmbh.de>

Reviewed-on: https://code.forgejo.org/forgejo/end-to-end/pulls/1274
Reviewed-by: earl-warren <earl-warren@noreply.code.forgejo.org>
Reviewed-by: Beowulf <beowulf@noreply.code.forgejo.org>
Co-authored-by: famfo <famfo@famfo.xyz>
Co-committed-by: famfo <famfo@famfo.xyz>

federation/scenario-mastodon/run.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+source "$DIR/federation_scenario-$scenario-env"
+
+if [[ -z "$password" ]]; then
+    exit 1
+fi
+
+if [[ -z "$port" ]]; then
+    exit 1
+fi
+
+status_code="$(curl -o /dev/null -w '%{http_code}' "http://localhost:$port/")"
+if [[ "$status_code" != "200" ]]; then
+    exit 1
+fi
+