Use our own builder to speed-up a bit, remove stretch build

.gitlab-ci.yml

@@ -8,7 +8,7 @@ stages:
 
 # Stage "build"
 build-jessie:
-  image: debian:jessie
+  image: registry.gitlab.com/fusslab/builder:jessie
   stage: test
   script:
     - rm ../* || true
@@ -30,31 +30,9 @@ build-jessie:
     paths:
       - artifacts/*
 
-build-stretch:
-  image: debian:stretch
-  stage: test
-  script:
-    - rm ../* || true
-    - apt-get update -qy
-    - apt-get install -y build-essential debhelper libncurses5-dev libglib2.0-dev libgeoip-dev libtokyocabinet-dev zlib1g-dev libncursesw5-dev libbz2-dev dh-python python-all python-setuptools python3-all python3-setuptools python3-metaconfig python3-jinja2 python3-pip kpartx parted qemu-utils qemu-user-static python3-jinja2 python3-yaml dh-systemd python3-setuptools devscripts equivs gnupg2 ca-certificates
-    - curl https://archive.fuss.bz.it/apt.key | apt-key add -
-    - echo "deb http://archive.fuss.bz.it/ stretch main contrib" >> /etc/apt/sources.list
-    - apt-get update -qy
-    - mk-build-deps
-    - dpkg -i octonet*deps*.deb || apt-get install -fy
-    - rm octonet*deps*.deb
-    - debian/rules debsrc
-    - debian/rules binary
-    - mkdir artifacts
-    - cp ../* artifacts || true
-
-  # The files which are to be made available in GitLab
-  artifacts:
-    paths:
-      - artifacts/*
 
 build-buster:
-  image: debian:buster
+  image: registry.gitlab.com/fusslab/builder:buster
   stage: test
   script:
     - rm ../* || true