Running camo-rs on systemd is relatively easy. For reference, here is a service file you can use:
[Unit]
Description=an HTTP proxy for assets (mainly images) to route requests through an always-encrypted connection
[Service]
User=nobody
EnvironmentFile=/etc/camo
ExecStart=/usr/bin/camo
[Install]
WantedBy=multi-user.target
Replace the binary location, and the location of the EnvironmentFile as needed. For all available and required environment variables, check the documentation about configuring camo-rs.
A /etc/camo file could look like this:
CAMO_KEY=supersecretkey
CAMO_ROOT_URL=/
CAMO_ALLOW_IMAGE=true