code: def env_get(context):
      
      get = context['env'].get('get', None)
  
      exists = False
      if get:
          logger.debug("start")
  
          for k, v in get.items():
              logger.debug(f"setting context {k} to $ENV {v}")
              context[k] = os.environ[v]
  
          logger.info(f"saved {len(get)} $ENVs to context.")
          exists = True
  
          logger.debug("done")
      return exists
docs: Get $ENVs into the pypyr context.
  
      Context is a dictionary or dictionary-like. context is mandatory.
  
      context['env']['get'] must exist. It's a dictionary.
      Values are the names of the $ENVs to write to the pypyr context.
      Keys are the pypyr context item to which to write the $ENV values.
  
      For example, say input context is:
          key1: value1
          key2: value2
          pypyrCurrentDir: value3
          env:
              get:
                  pypyrUser: USER
                  pypyrCurrentDir: PWD
  
      This will result in context:
          key1: value1
          key2: value2
          key3: value3
          pypyrUser: <<value of $USER here>>
          pypyrCurrentDir: <<value of $PWD here, not value3>>