Fix: Manpages Script breaks Dockerfiles

[mohamedawnallah]

Change Description

Currently dev.Dockerfile fails while running the scripts/gen_man_pages.sh script for two main reasons:

• The base imagegolang:1.21.0-alpine doesn't have bash installed by default so we need to manually install it.
• It also doesn't have the man/man1 directory in /usr/local/share directory so we need to create it if it doesn't exist.

Fixes #8557

Steps to Test

Tested it locally

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[carlaKC]

tACK @ aec4c06f479b035d5465c0e29e877d02b46ccafa, thanks for the quick fix 🏅

[guggero]

Thanks for the fix! Two small requests.

[guggero]

Should use function check_lncli_installed().

[guggero]

We should always use the if [[ ... ]] syntax.

[guggero]

I think we can directly do mkdir -p "$FULLPATH/share/man/man1" here, as it doesn't fail if the directory already exists.

[guggero]

tACK, LGTM 🎉