Merge branch '2449-add-debian-9' into 'master'

Add CI jobs for building and testing packages on Debian 9

Closes #2449

See merge request !1634

.gitlab-ci.yml

@@ -97,6 +97,7 @@ Centos 6 knapsack: *prepare_knapsack
 Centos 7 knapsack: *prepare_knapsack
 Debian 7 knapsack: *prepare_knapsack
 Debian 8 knapsack: *prepare_knapsack
+Debian 9 knapsack: *prepare_knapsack
 OpenSUSE 42.2 knapsack: *prepare_knapsack
 Ubuntu 14.04 knapsack: *prepare_knapsack
 Ubuntu 16.04 knapsack: *prepare_knapsack
@@ -469,6 +470,33 @@ Debian 8 specs 2 3:
   <<: *run_rspec
   dependencies:
   - Debian 8 knapsack
+Debian 9 specs 0 3:
+  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:omnibus-gitlab-stretch"
+  cache:
+    key: "$CI_JOB_NAME-1"
+    paths:
+    - gems
+  <<: *run_rspec
+  dependencies:
+  - Debian 9 knapsack
+Debian 9 specs 1 3:
+  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:omnibus-gitlab-stretch"
+  cache:
+    key: "$CI_JOB_NAME-1"
+    paths:
+    - gems
+  <<: *run_rspec
+  dependencies:
+  - Debian 9 knapsack
+Debian 9 specs 2 3:
+  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:omnibus-gitlab-stretch"
+  cache:
+    key: "$CI_JOB_NAME-1"
+    paths:
+    - gems
+  <<: *run_rspec
+  dependencies:
+  - Debian 9 knapsack
 Centos 6 specs 0 3:
   image: "registry.gitlab.com/gitlab-org/gitlab-build-images:omnibus-gitlab-centos6"
   cache:
@@ -584,6 +612,14 @@ Debian 8:
     - cache
     - gems
   <<: *tag_build
+Debian 9:
+  image: "dev.gitlab.org:5005/cookbooks/gitlab-omnibus-builder:debian_9-${BUILDER_IMAGE_REVISION}"
+  cache:
+    key: "Debian 9 branch"
+    paths:
+    - cache
+    - gems
+  <<: *tag_build
 Centos 6:
   image: "dev.gitlab.org:5005/cookbooks/gitlab-omnibus-builder:centos_6-${BUILDER_IMAGE_REVISION}"
   cache:
@@ -655,6 +691,14 @@ Debian 8 branch:
     - cache
     - gems
   <<: *branch_build
+Debian 9 branch:
+  image: "dev.gitlab.org:5005/cookbooks/gitlab-omnibus-builder:debian_9-${BUILDER_IMAGE_REVISION}"
+  cache:
+    key: "$CI_BUILD_NAME"
+    paths:
+    - cache
+    - gems
+  <<: *branch_build
 CentOS 6 branch:
   image: "dev.gitlab.org:5005/cookbooks/gitlab-omnibus-builder:centos_6-${BUILDER_IMAGE_REVISION}"
   cache: