github.com/containers/podman/v5@v5.1.0-rc1/docs/source/markdown/options/env.image.md (about)

     1  ####> This option file is used in:
     2  ####>   podman build, farm build
     3  ####> If file is edited, make sure the changes
     4  ####> are applicable to all of those.
     5  #### **--env**=*env[=value]*
     6  
     7  Add a value (e.g. env=*value*) to the built image.  Can be used multiple times.
     8  If neither `=` nor a *value* are specified, but *env* is set in the current
     9  environment, the value from the current environment is added to the image.
    10  To remove an environment variable from the built image, use the `--unsetenv`
    11  option.