podman/docs/source/markdown/options/env.image.md

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####> This option file is used in:
####> podman build, farm build
####> If file is edited, make sure the changes
####> are applicable to all of those.
#### **--env**=*env[=value]*
Add a value (e.g. env=*value*) to the built image. Can be used multiple times.
If neither `=` nor a *value* are specified, but *env* is set in the current
environment, the value from the current environment is added to the image.
To remove an environment variable from the built image, use the `--unsetenv`
option.