feat: implement Mattermost proxy mirror with configuration and scripts for capturing traffic

scripts/mattermost-proxy/run-mirror.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+WORKSPACE_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
+
+if [ -f "$SCRIPT_DIR/.env" ]; then
+  set -a
+  # shellcheck source=/dev/null
+  source "$SCRIPT_DIR/.env"
+  set +a
+fi
+
+export MATTERMOST_MIRROR_DIR="${MATTERMOST_MIRROR_DIR:-$WORKSPACE_ROOT/ai/inbox/mattermost-mirror}"
+export MATTERMOST_MIRROR_LISTEN_HOST="${MATTERMOST_MIRROR_LISTEN_HOST:-127.0.0.1}"
+export MATTERMOST_MIRROR_LISTEN_PORT="${MATTERMOST_MIRROR_LISTEN_PORT:-8080}"
+
+mkdir -p "$MATTERMOST_MIRROR_DIR"
+
+echo "Mattermost proxy mirror output: $MATTERMOST_MIRROR_DIR"
+echo "Listening on ${MATTERMOST_MIRROR_LISTEN_HOST}:${MATTERMOST_MIRROR_LISTEN_PORT}"
+echo "Launch Mattermost Desktop with: scripts/mattermost-proxy/launch-mattermost.sh"
+
+exec mitmdump \
+  --listen-host "$MATTERMOST_MIRROR_LISTEN_HOST" \
+  --listen-port "$MATTERMOST_MIRROR_LISTEN_PORT" \
+  -s "$SCRIPT_DIR/mattermost_mirror.py"