Unable to run 2 dependent commands in the same whenever cron job

Question

I work on a Rails based website for which I have to create a sitemap using the sitemap_generator gem.

So far so good, until I reached the part where I have to automate the sitemap generation. The 2 commands that I need to run in order to refresh the sitemap are direnv allow && rake sitemap:refresh.

I am trying to create a cron job by using the whenever gem and this is what I have inside config/schedule.rb:

# config/schedule.rb

set :output, "tmp/cron.log"
set :environment, "development"

every 1.minutes do
    command "/Users/<user>/<project>/generate_sitemap.sh"
end

The generate_sitemap.sh file is in the project root and has the following content:

# generate_sitemap.sh
#!/bin/bash

direnv allow
rake sitemap:refresh

In order to activate the cron job, I execute whenever --update-crontab in the terminal. By running crontab -l, I have the following output:

# Begin Whenever generated tasks for: /Users/<user>/<project>/config/schedule.rb at: 2022-01-27 18:51:18 +0200
* * * * * /bin/bash -l -c '/Users/<user>/<project>/generate_sitemap.sh >> tmp/cron.log 2>&1'

# End Whenever generated tasks for: /Users/<user>/<project>/config/schedule.rb at: 2022-01-27 18:51:18 +0200

I have to mention that if I execute ./generate_sitemap.sh from the command line, it works. Furthermore, if I create a cron job as follows: config/schedule.rb:

# config/schedule.rb

set :output, "tmp/cron.log"
set :environment, "development"

every 1.minutes do
    rake "sitemap:refresh"
end

it is executed, but it results into an error since direnv allow was not executed beforehand.

My question is: how can I create a cron job which executes both direnv allow and rake sitemap:refresh?