Merge ~pwlars/snappy-hwe-snaps/+git/jenkins-jobs:debconf-selections-fix into ~snappy-hwe-team/snappy-hwe-snaps/+git/jenkins-jobs:master

[Paul Larson]

the prepare.sh script uses dash, not bash. This should fix the error when setting up debconf selections for postfix

[System Enablement Bot (system-enablement-ci-bot)]

PASSED: Continuous integration, rev:2abb3497944d376e95b30994c55e730a03c63d4b
https://jenkins.canonical.com/system-enablement/job/generic-build-snap/1869/
Executed test runs:
    SUCCESS: https://jenkins.canonical.com/system-enablement/job/generic-build-snap-worker/2941
    None: https://jenkins.canonical.com/system-enablement/job/generic-update-snap-mp/1777/console
    SUCCESS: https://jenkins.canonical.com/system-enablement/job/generic-test-snap/3222

Click here to trigger a rebuild:
https://jenkins.canonical.com/system-enablement/job/generic-build-snap/1869/rebuild

review: Approve (continuous-integration)

[Simon Fels (morphis)]

LGTM, tested in my local jenkins setup.

review: Approve

diff --git a/jobs/infrastructure/prepare-0-install.sh b/jobs/infrastructure/prepare-0-install.sh
index 7dc2379..a41e811 100644
--- a/jobs/infrastructure/prepare-0-install.sh
+++ b/jobs/infrastructure/prepare-0-install.sh
@@ -23,8 +23,8 @@ sudo add-apt-repository --yes ppa:snappy-hwe-team/ci-tools
 
 sudo apt-get update
 
-debconf-set-selections <<< "postfix postfix/mailname string $(hostname)"
-debconf-set-selections <<< "postfix postfix/main_mailer_type string 'Internet Site'"
+echo "postfix postfix/mailname string $(hostname)" | debconf-set-selections
+echo  "postfix postfix/main_mailer_type string 'Internet Site'" | debconf-set-selections
 
 sudo apt-get install --yes \
     git \