Restore the indentation on the gunicorn worker block

The threaded-worker arguments were pasted at column 0 instead of under the api service's command list, so the file stopped parsing as YAML: compose failed with 'did not find expected key' at the services mapping and no build or up could run at all.

Indentation only - the arguments themselves are unchanged, and the stack still runs gthread with 4 workers and 8 threads on a 30 second timeout.

docker-compose.yml

@@ -79,25 +79,25 @@ services:
       - gunicorn
       - --bind
       - 0.0.0.0:5001
-# Threaded workers, not the blocking sync default. An agent that fails
+      # Threaded workers, not the blocking sync default. An agent that fails
-# the TLS handshake retries in a loop, and with 4 sync workers a handful
+      # the TLS handshake retries in a loop, and with 4 sync workers a handful
-# of those pinned every worker: real UI requests queued 20+ seconds while
+      # of those pinned every worker: real UI requests queued 20+ seconds while
-# the CPU sat idle. A stuck connection now holds one THREAD, and 32
+      # the CPU sat idle. A stuck connection now holds one THREAD, and 32
-# (4 x 8) have to be exhausted before a person waits.
+      # (4 x 8) have to be exhausted before a person waits.
-#
+      #
-# Found in production at the other site (their commit db75ca7). Their
+      # Found in production at the other site (their commit db75ca7). Their
-# server, our agent - so the same client behaviour will reach any site
+      # server, our agent - so the same client behaviour will reach any site
-# running the endpoint agent, and the fix belongs in the product rather
+      # running the endpoint agent, and the fix belongs in the product rather
-# than on one branch.
+      # than on one branch.
-- --worker-class
+      - --worker-class
-- gthread
+      - gthread
-- --workers
+      - --workers
-- "4"
+      - "4"
-- --threads
+      - --threads
-- "8"
+      - "8"
-# 30, not 60: a hung connection frees its thread in half the time, which
+      # 30, not 60: a hung connection frees its thread in half the time, which
-# is what decides whether a retry storm is absorbed or queues.
+      # is what decides whether a retry storm is absorbed or queues.
-- --timeout
+      - --timeout
       - "30"
       - --access-logfile
       - "-"