feedbin-web image build failure

[arikw]

Hi, the build stage fails on RUN apk add... with:

#0 74.20 capybara-3.39.0 requires ruby version >= 3.0.0, which is incompatible with the
#0 74.20 current version, 2.7.6

[giveanornot]

Changing the alpine version in feedbin-web/Dockerfile from 3.13 to 3.18 solves this issue.