Shorten job names

.gitlab-ci.yml

 stages:
   - test source
-  - build images
-  - test images
-  - release images
-  - deploy images
+  - build
+  - test
+  - release
+  - deploy
 
 # Job 1
 flake8:
@@ -55,7 +55,7 @@ amd64 image:
     - master
   tags:
     - x86_64
-  stage: build images
+  stage: build
   image: docker:stable
   services:
     - docker:dind
@@ -74,7 +74,7 @@ arm image:
     - master
   tags:
     - armv71
-  stage: build images
+  stage: build
   image: docker:stable
   services:
     - docker:dind
@@ -93,7 +93,7 @@ amd64 unit test:
     - master
   tags:
     - x86_64
-  stage: test images
+  stage: test
   image: docker:stable
   services:
     - docker:dind
@@ -119,7 +119,7 @@ arm unit test:
     - master
   tags:
     - armv71
-  stage: test images
+  stage: test
   image: docker:stable
   services:
     - docker:dind
@@ -140,12 +140,12 @@ arm unit test:
     - docker-compose -f docker-compose.test.yml -p test up --abort-on-container-exit
 
 # Job 8
-make release:
+release:
   only:
     - master
   tags:
     - armv71
-  stage: release images
+  stage: release
   image: docker:stable
   services:
     - docker:dind
@@ -169,12 +169,12 @@ make release:
 
 
 # Job 9
-staging environment:
+staging:
   only:
     - master
   tags:
     - armv71
-  stage: deploy images
+  stage: deploy
   image: debian:stable
   environment:
     name: staging
@@ -196,13 +196,13 @@ staging environment:
     - curl -XPOST -H "Fastly-Key:${FASTLY_KEY}" https://api.fastly.com/service/${FASTLY_SERVICE}/purge_all
 
 # Job 10
-production environment:
+production:
   when: manual
   only:
     - master
   tags:
     - armv71
-  stage: deploy images
+  stage: deploy
   image: debian:stable
   environment:
     name: production