Install envsubst for allowing template expansions

gettext-base contains envsubst which is extensively used in
Docker container builds to expand templates using environment variables.

When migrating from Ubuntu to Debian, this command was missing
and it caused the failures of many builds of Gerrit <= 2.13

Change-Id: I9dfe00468b62a8792dbfcfac4a39bcff8abaf6fc
1 file changed
tree: 2a6b5a85d631e5e22dd179a1382db45936cdb1c6
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore