Service environment variables are in ~/.env
- pi-hole
$ sudo cat /usr/local/share/acme.sh/syno.farmerbean.dev/syno.farmerbean.dev.key \
/usr/local/share/acme.sh/syno.farmerbean.dev/syno.farmerbean.dev.cer | \
sudo tee /usr/local/share/acme.sh/syno.farmerbean.dev/syno.farmerbean.dev.combined.pem