Add progress indicator to run-seedbox.sh

[tblaudez]

Add a progress indicator to the configuration loop in run-seedbox.sh
I added this to avoid frustration when running the script is lengthy (especially when my VPS in under heavy load).

The JSON configuration is put in a variable casted a as Bash array so that we can still loop over it AND retrieve its length.
Another variable is added to count the current iteration of the loop.

Using this information, we use printf to add a new output line with constant width that indicates the current progress.
This line is being constantly overwritten by each iteration thanks to the carriage return and the constant width.
When we are on the last iteration of the loop; we break out of the progress line by adding a sole newline.

Cette fois c'est une vraie PR mdr

[gitguardian]

⚠️ GitGuardian has uncovered 2 secrets following the scan of your pull request.

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🔎 Detected hardcoded secrets in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
878723	Triggered	Generic Password	3bb3662	.env.sample	View secret
878724	Triggered	Generic Password	3bb3662	.env.sample	View secret

🛠 Guidelines to remediate hardcoded secrets

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[tblaudez]

Edit: Changed base from dev to master since I edited from this branch

[jfroment]

Could you please target dev instead of master so the changes here will be part of next release?
I try to keep the master branch tied to releases so newcomers or people who want stability have all tested/validated/documented changes only in master. No problem if the change originates from master as they are no breaking changes.

[jfroment]

Actually I can target dev myself :)

[tblaudez]

Sure thing ! I'll keep it in mind for the next PRs and use dev as the source branch.

[tblaudez]

I noticed the progress bar was breaking visuals when debug mode is active, so I added a condition to disable it