source not found / modoboa user default shell is set to sh

[nicosqc]

Impacted versions

• Distribution: Debian
• Codename: 10 (buster)
• Arch: 64 Bits
• Database: PostgreSQL

Steps to reproduce

run the installer with no modification on a clean install
run sudo -u modoboa -i
run source /srv/modoboa/env/bin/activate
results in -sh: 9: source: not found

Expected behavior

Install /bin/bash as login shell or adjust docs to reflect the additional step of starting bash before using source /srv/modoboa/env/bin/activate for the migration if sh is neccesary as default shell for other components.

A minor thing but maybe it trips up an inexperienced user just trying to follow the upgrade prodedure explained in the upgrade documentation.

[tonioo]

@nicosqc Good catch. Could you create a PR with a documentation update?

[Spitfireap]

Documentation update, thanks !