Install Vikunja from binary on Ubuntu Server

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Hello.
I’m trying to install Vikunja as service on Ubuntu Server.

I thought that Vikunja don’t need HOME folder if it has WorkingDirectory, and created dedicated user with this command:
useradd --system --shell /usr/sbin/nologin --no-create-home vikunja

But after first launch I got error:
failed to create modcache index dir: mkdir /home/vikunja: permission denied

I started from over and make user with this:
useradd --system --shell /usr/sbin/nologin --home /home/vikunja --create-home vikunja

After that I created other folders:
mkdir /var/lib/vikunja
chown vikunja:vikunja /var/lib/vikunja
chmod 755 /var/lib/vikunja
mkdir /etc/vikunja

Copied executable and configuration file:
cp vikunja-v2.1.0-linux-amd64 /usr/local/bin/vikunja
cp config.yml.sample /etc/vikunja/config.yml

I configuration file was changed only two lines:
# service: service:
# publicurl: "" publicurl: "http://10.0.2.15"

And make service unit file:

[Unit]
Description=Vikunja

[Service]
Type=simple
User=vikunja
Group=vikunja
WorkingDirectory=/var/lib/vikunja
ExecStart=/usr/local/bin/vikunja
Restart=on-failure

Service can’t start, and give me failure:
Could not init file handler: storage validation failed: failed to create file storage directory at /usr/local/bin/files: mkdir /usr/local/bin/files: permission denied

I’ve modified service unit file to get output of doctor command:
StandardOutput=append:/tmp/vikunja.log

This is Vikunja doctor report:

Vikunja Doctor
==============

System
  ✓ Version: v2.1.0
  ✓ Go: go1.26.0
  ✓ OS: linux/amd64
  ✓ User: vikunja (uid=998)
  ✓ Working directory: /var/lib/vikunja
  ✓ User namespace: not active

Configuration
  ✓ Config file: /etc/vikunja/config.yml
  ✓ Public URL: http://10.0.2.15/
  ✓ JWT secret: configured (auto-generated)
  ✓ CORS origins: http://127.0.0.1:*
      http://localhost:*
      http://10.0.2.15

Database (sqlite)
  ✗ Connection: could not open database file [uid=998, gid=997]: open /usr/local/bin/vikunja.db: permission denied

Files (local)
  ✗ Initialization: storage validation failed: failed to create file storage directory at /usr/local/bin/files: mkdir /usr/local/bin/files: permission denied
[process uid=998 gid=997]

2 check(s) failed

Report show that Vikunja see right path of working directory but why is trying to create storage directory and database file in binary folder?

P.S. When I set service.rootpath in /etc/vikunja/config.yml as /var/lib/vikunja
Vikunja create files folder in that path but still trying to make database on /usr/local/bin/vikunja.db

Supports page here Configuration options tells:

If service.rootpath is explicitly configured (differs from the binary location), the database path is resolved relative to that directory