chore(main): release 1.4.0

:robot: I have created a release beep boop

Add topgrade support (8a926c5)
Add topgrade support (#102) (61dd86c)
Add updater for brew (#76) (63d40a1)
auto sign images (#73) (6acce45)
move system update script to python (#81) (be229d1)
Remove rebase step now that ISOs are nearly ready (#105) (1e670f0)
Remove rebase step now that ISOs are nearly ready, move topgrade configs to /usr/share, cleanup. (8307b17)
system-update: Allow switching between branches via rebase (e14f166)
system-update: Allow switching between branches via rebase (#91) (e013061)

account for ostree-unverified-registry shorthand (8271032)
add brew to user and distrobox to system (2e0e582)
add brew to user and distrobox to system (#107) (d8fb315)
be more carefull when to rebase (2ba442f)
be more carefull when to rebase (#88) (427912c)
bump version (32ccf70)
bypass distrobox upgrade sudo checks (#69) (127ed90)
flake8: Ignore W503 and W504 (5111b06)
Improve brew updater to work even if bash_profile change is missing (#82) (9993055)
min_battery_percent = 0 now works to "skip" (5ad9228)
min_battery_percent = 0 now works to "skip" battery check (#89) (c1f7355)
offline iso update (ea267e0)
offline iso update (#87) (986ed9a)
only show post update notification when there is a pending deployment (#83) (e117cc8)
preserve unsigned image tag upon rebase (0ff9fd5)
preserve unsigned image tag upon rebase (#75) (75fd78b)
try to use staging copr project (#71) (2686474)
update error message logging, log subprocess output (#77) (007e1e3)

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