Remove 'redshift' runner tags

We have three runners, which can take the jobs when available

Set 'docker' tag when it requires a Docker capable runner

.gitlab-ci.yml

@@ -23,8 +23,6 @@ workflow:
 
 .env: &env
   image: registry.duniter.org/docker/duniter-ci:v0.0.4
-  tags:
-    - redshift
   before_script:
     - export NVM_DIR="$HOME/.nvm"
     - . "$NVM_DIR/nvm.sh"
@@ -124,8 +122,6 @@ sync_gtest:
   stage: package
   image: duniter/release-builder:v1.4.0
   cache: {}
-  tags:
-    - redshift
   artifacts:
     paths: &releases_artifacts
       - work/bin/
@@ -159,7 +155,7 @@ releases:x64:
   stage: package
   image: docker:18.06
   tags:
-    - redshift
+    - docker
   services:
     - docker:18.06-dind
   before_script:
@@ -197,7 +193,7 @@ package:prod:docker:
     - if: $CI_COMMIT_TAG
   image: docker:18.06
   tags:
-    - redshift
+    - docker
   services:
     - docker:18.06-dind
   script:
@@ -212,8 +208,6 @@ package:prod:docker:
 
 .release_jobs: &release_jobs
   image: rdadev/jinja2:py3.6
-  tags:
-    - redshift
   script:
     - python3 .gitlab/releaser