Reconsider setting TAILS_CHANNEL=alpha for alphas/betas/RCs
Originally created by @anonym on #12458 (Redmine)
Since ecfceac5 we started to set
TAILS_CHANNEL=alpha
in /etc/os-release
for alphas/betas/RCs. A
problem with this vs our current release process is that people running
such release will get the updates we publish on the alpha channels (for
our manual test session) before they are released.
Feature Branch: bugfix/12458-channel