How to pass custom environment variable in systemd unit file ?

Solution Verified - Updated 2024-06-13T21:02:16+00:00 -

Issue

Unable to pass custom environment variable in systemd unit file definition.
```
Environment="VAR1=VALUE1"
Environment="VAR2=$VAR1 VALUE2" 
```
The variable $VAR1 does not get resolved with correct value (VALUE1).
Use of EnvironmentFile did not resolve the value of the environment variable $VAR1.

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