[native debian package] Unable start gitaly

Using debian native package of gitaly. Seems gitaly don't have a -verbose or -debug option to get more details.

root@gitlab:~# gitaly -version
Gitaly, version , built 

gitaly package is built from https://anonscm.debian.org/cgit/pkg-go/packages/gitaly.git

cc @jacobvosmaer-gitlab @balasankarc

root@gitlab:~# su gitlab -c 'gitaly /etc/gitaly/config.toml'
INFO[0000] Starting Gitaly                               version="Gitaly, version , built "
WARN[0000] git path not configured. Using default path resolution  resolvedPath=/usr/bin/git
WARN[0000] git path not configured. Using default path resolution  resolvedPath=/usr/bin/git
WARN[0000] Gitaly bin directory is not configured        error="not a directory: \"/usr/bin/gitaly\""
FATA[0000] load config                                   config_path=/etc/gitaly/config.toml error="load linguist colors: exit status 10; stderr: \"\""

root@gitlab:~# cat /etc/gitaly/config.toml 
# Example Gitaly configuration file

socket_path = "/usr/share/gitlab/tmp/sockets/private/gitaly.socket"

# The directory where Gitaly's executables are stored
bin_dir = "/usr/bin/gitaly"

# # Optional: listen on a TCP socket. This is insecure (no authentication)
# listen_addr = "localhost:9999"
#

# # Optional: export metrics via Prometheus
# prometheus_listen_addr = "localhost:9236"
#

# # Git executable settings
# [git]
# bin_path = "/usr/bin/git"

[[storage]]
name = "default"
path = "/var/lib/gitlab/repositories"

# # You can optionally configure more storages for this Gitaly instance to serve up
#
# [[storage]]
# name = "other_storage"
# path = "/mnt/other_storage/repositories"
#

# # You can optionally configure Gitaly to output JSON-formatted log messages to stdout
# [logging]
# format = "json"
# # Additionally exceptions from the Go server and gitaly-ruby can be reported to Sentry
# sentry_dsn = "https://<key>:<secret>@sentry.io/<project>"

# # You can optionally configure Gitaly to record histogram latencies on GRPC method calls
# [prometheus]
# grpc_latency_buckets = [0.001, 0.005, 0.025, 0.1, 0.5, 1.0, 10.0, 30.0, 60.0, 300.0, 1500.0]

[gitaly-ruby]
# The directory where gitaly-ruby is installed
dir = "/usr/share/rubygems-integration/all/gems/gitaly-proto-0.89.0/ruby"

# # Gitaly-ruby resident set size (RSS) that triggers a memory restart (bytes)
# max_rss = 300000000
# 
# # Grace period before a gitaly-ruby process is forcibly terminated after exceeding max_rss (seconds)
# graceful_restart_timeout = "10m"
# 
# # Time that gitaly-ruby memory must remain high before a restart (seconds)
# restart_delay = "5m"

[gitlab-shell]
# The directory where gitlab-shell is installed
dir = "/usr/share/gitlab-shell"

# # You can adjust the concurrency of each RPC endpoint
# [[concurrency]]
# rpc = "/gitaly.RepositoryService/GarbageCollect"
# max_per_repo = 1