travis: temporarilly enable PPA builds for testing (ethereum#29648)

Author: karalabe

.travis.yml

@@ -123,7 +123,6 @@ jobs:
 
     # This builder does the Ubuntu PPA nightly uploads
     - stage: build
-      if: type = cron || (type = push && tag ~= /^v[0-9]/)
       os: linux
       dist: bionic
       go: 1.22.x