Deployment to staging

Next up is adding a deployment to the staging environment, which includes building a docker image and pushing it to the APPUiO registry.

.gitlab-ci.yml
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stages:
  - build
  - deploy-staging

variables:
  OC_REGISTRY_URL: registry.appuio.ch
  OC_REGISTRY_IMAGE: $OC_REGISTRY_URL/$KUBE_NAMESPACE/webserver
  OC_VERSION: 3.11.0
  ...

test: ...
compile: ...

build-staging:
  environment: webserver-staging
  stage: deploy-staging
  image: appuio/gitlab-runner-oc:$OC_VERSION
  services:
    - docker:dind
  script:
    # login to the service account to get access to the internal registry
    - oc login $KUBE_URL --token=$KUBE_TOKEN
    - docker login -u serviceaccount -p `oc whoami -t` $OC_REGISTRY_URL
    # build the docker image and tag it as latest
    # use the current latest image as a caching source
    - docker pull $OC_REGISTRY_IMAGE:latest
    - docker build --cache-from $OC_REGISTRY_IMAGE:latest -t $OC_REGISTRY_IMAGE:latest .
    # push the image to the internal registry
    - docker push $OC_REGISTRY_IMAGE:latest
  only:
    - master
  except:
    - tags

We added both the directives only and except in this step, as we want to run build-staging only for events on master, except if that event is tagging a release.