CI: Add auto-deployment via dokku.

.buildpacks

+https://github.com/hashnuke/heroku-buildpack-elixir  

.gitlab-ci.yml

@@ -95,3 +95,50 @@ docs-deploy:
     - eval $(ssh-agent -s)
     - echo "$SSH_PRIVATE_KEY" | tr -d '\r' | ssh-add -
     - rsync -hrvz --delete -e "ssh -p ${SSH_PORT}" priv/static/doc/ "${SSH_USER_HOST_LOCATION}/${CI_COMMIT_REF_NAME}"
+
+review_app:
+  image: alpine:3.9
+  stage: deploy
+  before_script:
+    - apk update && apk add openssh-client git
+  when: manual
+  environment:
+    name: review/$CI_COMMIT_REF_NAME
+    url: https://$CI_ENVIRONMENT_SLUG.pleroma.online/
+    on_stop: stop_review_app
+  only:
+    - branches
+  except:
+    - master
+    - develop
+  script:
+    - echo "$CI_ENVIRONMENT_SLUG"
+    - mkdir -p ~/.ssh
+    - eval $(ssh-agent -s)
+    - echo "$SSH_PRIVATE_KEY" | tr -d '\r' | ssh-add -
+    - ssh-keyscan -H "pleroma.online" >> ~/.ssh/known_hosts
+    - (ssh -t dokku@pleroma.online -- apps:create "$CI_ENVIRONMENT_SLUG") || true
+    - ssh -t dokku@pleroma.online -- config:set "$CI_ENVIRONMENT_SLUG" APP_NAME="$CI_ENVIRONMENT_SLUG" APP_HOST="$CI_ENVIRONMENT_SLUG.pleroma.online" MIX_ENV=dokku
+    - (ssh -t dokku@pleroma.online -- postgres:create $(echo $CI_ENVIRONMENT_SLUG | sed -e 's/-/_/g')_db) || true
+    - (ssh -t dokku@pleroma.online -- postgres:link $(echo $CI_ENVIRONMENT_SLUG | sed -e 's/-/_/g')_db "$CI_ENVIRONMENT_SLUG") || true
+    - (ssh -t dokku@pleroma.online -- certs:add "$CI_ENVIRONMENT_SLUG" /home/dokku/server.crt /home/dokku/server.key) || true
+    - (git remote add dokku dokku@pleroma.online:$CI_ENVIRONMENT_SLUG) || true
+    - git push -f dokku $CI_COMMIT_SHA:refs/heads/master
+
+stop_review_app:
+  image: alpine:3.9
+  stage: deploy
+  before_script:
+    - apk update && apk add openssh-client git
+  when: manual
+  environment:
+    name: review/$CI_COMMIT_REF_NAME
+    action: stop
+  script:
+    - echo "$CI_ENVIRONMENT_SLUG"
+    - mkdir -p ~/.ssh
+    - eval $(ssh-agent -s)
+    - echo "$SSH_PRIVATE_KEY" | tr -d '\r' | ssh-add -
+    - ssh-keyscan -H "pleroma.online" >> ~/.ssh/known_hosts
+    - ssh -t dokku@pleroma.online -- --force apps:destroy "$CI_ENVIRONMENT_SLUG"
+    - ssh -t dokku@pleroma.online -- --force postgres:destroy $(echo $CI_ENVIRONMENT_SLUG | sed -e 's/-/_/g')_db

Procfile

+web: mix phx.server
+release: mix ecto.migrate

config/dokku.exs

+use Mix.Config
+
+config :pleroma, Pleroma.Web.Endpoint,
+  http: [
+    port: String.to_integer(System.get_env("PORT") || "4000"),
+    protocol_options: [max_request_line_length: 8192, max_header_value_length: 8192]
+  ],
+  protocol: "http",
+  secure_cookie_flag: false,
+  url: [host: System.get_env("APP_HOST"), scheme: "https", port: 443],
+  secret_key_base: "+S+ULgf7+N37c/lc9K66SMphnjQIRGklTu0BRr2vLm2ZzvK0Z6OH/PE77wlUNtvP"
+
+database_url =
+  System.get_env("DATABASE_URL") ||
+    raise """
+    environment variable DATABASE_URL is missing.
+    For example: ecto://USER:PASS@HOST/DATABASE
+    """
+
+config :pleroma, Pleroma.Repo,
+  # ssl: true,
+  url: database_url,
+  pool_size: String.to_integer(System.get_env("POOL_SIZE") || "10")
+
+config :pleroma, :instance, name: "#{System.get_env("APP_NAME")} CI Instance"

elixir_buildpack.config

+elixir_version=1.8.2
+erlang_version=21.3.7