Sometimes pipeline fails on install zip & unzip packages

$ apt-get update; apt-get install -y zip unzip
Get:1 http://security.debian.org jessie/updates InRelease [63.1 kB]
Hit https://deb.nodesource.com jessie InRelease
Ign http://httpredir.debian.org jessie InRelease
Get:2 http://deb.debian.org jessie-updates InRelease [145 kB]
Get:3 http://httpredir.debian.org jessie Release.gpg [2373 B]
Get:4 http://httpredir.debian.org jessie Release [148 kB]
Get:5 http://security.debian.org jessie/updates/main amd64 Packages [464 kB]
Get:6 https://deb.nodesource.com jessie/main Sources [766 B]
Get:7 https://deb.nodesource.com jessie/main amd64 Packages [957 B]
Get:8 http://httpredir.debian.org jessie/contrib amd64 Packages [59.5 kB]
Get:9 http://httpredir.debian.org jessie/non-free amd64 Packages [101 kB]
Get:10 http://deb.debian.org jessie-updates/main amd64 Packages [17.6 kB]
Fetched 1002 kB in 7s (131 kB/s)
Reading package lists...
Reading package lists...
Building dependency tree...
Reading state information...
Package zip is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'zip' has no installation candidate