SystemD - Environment Variable for a service

How to add environment to a service within SystemD

Shell - (Startup|Login) script (.bash_profile, .profile, .login)

[Unit]
Description=Starts the process
After=network.target

[Service]
User=user
ExecStartPre=/bin/sleep 5
ExecStart=/bin/bash -c '. "$0" && exec "[email protected]"' /home/user/.bash_profile /tomcat/bin/service.sh startup
ExecStop=/tomcat/bin/service.sh shutdown
Type=forking
TimeoutSec=infinity

[Install]
WantedBy=multi-user.target

[Service]
Environment="SECRET=pGNqdu23ffr9C2vijOmUDa2kPtUhArN"
Environment="ENV2=JP8YLOc00333887722Tq7L36obpjzxd"

[Service]
ExecStart=/usr/bin/whatever
EnvironmentFile=/path/to/env_service.conf

where :

IPV4_ANCHOR_0=X.X.X.X
PV4_PRIVATE_0=X.X.X.X
HOSTNAME=test.example.com
IPV4_PUBLIC_0=X.X.X.X
ENV1=X:X:X:X:X:X:X:X

• https://www.freedesktop.org/software/systemd/man/systemd.exec.html#Environment
• https://stackoverflow.com/questions/49764993/using-a-users-bashrc-in-a-systemd-service