chore(release): 2.1.1 [skip ci]

## [2.1.1](https://gitlab.com/to-be-continuous/docker/compare/2.1.0...2.1.1) (2021-10-07)

### Bug Fixes

* use master or main for production env ([5596daf3](https://gitlab.com/to-be-continuous/docker/commit/5596daf34cc9c64d73405ef490fe75c7ae50a177))

CHANGELOG.md

+## [2.1.1](https://gitlab.com/to-be-continuous/docker/compare/2.1.0...2.1.1) (2021-10-07)
+
+
+### Bug Fixes
+
+* use master or main for production env ([5596daf](https://gitlab.com/to-be-continuous/docker/commit/5596daf34cc9c64d73405ef490fe75c7ae50a177))
+
 ## [2.0.0](https://gitlab.com/to-be-continuous/docker/compare/1.2.3...2.0.0) (2021-09-02)
 
 ### Features

README.md

@@ -9,7 +9,7 @@ In order to include this template in your project, add the following to your `.g
 ```yaml
 include:
   - project: 'to-be-continuous/docker'
-    ref: '2.1.0'
+    ref: '2.1.1'
     file: '/templates/gitlab-ci-docker.yml'
 ```
 
@@ -307,7 +307,7 @@ Here is a `.gitlab-ci.yaml` using an external Docker registry:
 ```yaml
 include:
   - project: 'to-be-continuous/docker'
-    ref: '2.1.0'
+    ref: '2.1.1'
     file: '/templates/gitlab-ci-docker.yml'
 
 variables:
@@ -325,7 +325,7 @@ Here is a `.gitlab-ci.yaml` that builds 2 Docker images from the same project (u
 ```yaml
 include:
   - project: 'to-be-continuous/docker'
-    ref: '2.1.0'
+    ref: '2.1.1'
     file: '/templates/gitlab-ci-docker.yml'
 
 variables:

templates/gitlab-ci-docker.yml

@@ -367,7 +367,7 @@ stages:
     fi
   }
 
-  if [[ "$TEMPLATE_CHECK_UPDATE_DISABLED" != "true" ]]; then check_for_update docker "2.1.0"; fi
+  if [[ "$TEMPLATE_CHECK_UPDATE_DISABLED" != "true" ]]; then check_for_update docker "2.1.1"; fi
   init_workspace
 
   # ENDSCRIPT
@@ -375,7 +375,7 @@ stages:
 .docker-base:
   services:
     - name: "$CI_REGISTRY/to-be-continuous/tools/tracking:master"
-      command: ["--service", "docker", "2.1.0"]
+      command: ["--service", "docker", "2.1.1"]
   before_script:
     - *docker-scripts
 
@@ -404,7 +404,7 @@ stages:
     _TRACE: "${TRACE}"
   services:
     - name: "$CI_REGISTRY/to-be-continuous/tools/tracking:master"
-      command: ["--service", "docker", "2.1.0"]
+      command: ["--service", "docker", "2.1.1"]
     - name: $DOCKER_DIND_IMAGE
       alias: docker
       command: