Merge branch 'add-gelf-logging' into 'latest'

Adds GELF logging

See merge request docker/etherscan-exporter!2

Author: tlex

.gitlab-ci.yml

@@ -1,5 +1,7 @@
 variables:
   DOCKER_DRIVER: overlay2
+  IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
+  PORT: 9308
 
 stages:
   - lint
@@ -12,17 +14,18 @@ pylint:
   image: python:latest
   stage: lint
   script:
-    - pip install prometheus_client pylint requests
-    - pylint --rcfile=.pylintrc *.py
+    - curl -o .pylintrc https://tool.ix.ai/.pylintrc
+    - pip install prometheus_client pylint requests pygelf
+    - pylint --rcfile=.pylintrc src/*.py
 
 build:
   image: docker:latest
   stage: build
-  except:
-    - master
-  before_script:
-    - export IMAGE_TAG=${CI_REGISTRY_IMAGE}:${CI_COMMIT_REF_NAME}
+  only:
+    - /^latest$/
+    - tags
+    - /(.*)-dev$/
   script:
     - docker login -u gitlab-ci-token -p ${CI_JOB_TOKEN} ${CI_REGISTRY}
-    - docker build -f Dockerfile -t ${IMAGE_TAG} .
+    - docker build -f Dockerfile -t ${IMAGE_TAG} --build-arg PORT="${PORT}" .
     - docker push ${IMAGE_TAG}