MON-485 use docker image for claranet datadog terraform

.gitlab-ci.yml

@@ -5,18 +5,10 @@ stages:
   - build
   - deploy
 
-before_script:
-  - apk update
-  - apk upgrade
-  - apk add --no-cache curl
-
 auto_update:
-  image: hashicorp/terraform:0.12.3
+  image: qmanfroi/datadog-terraform:latest
   stage: test
   script:
-    - apk add --no-cache bash git grep coreutils
-    - curl -Lo /usr/local/bin/terraform-docs "https://github.com/$(curl -s https://github.com/segmentio/terraform-docs/releases | grep terraform-docs-v0.6.0-linux-amd | head -n 1 | cut -d '"' -f 2)"
-    - chmod +x /usr/local/bin/terraform-docs
     - ./scripts/auto_update.sh ./
     - git status
     - git diff --exit-code

README.md

@@ -10,7 +10,14 @@ To contribute you will need to [report an issue](https://confluence.fr.clara.net
 
 If you would like to resolve an issue or implement new monitors you must follow our [best practices](https://confluence.fr.clara.net/display/DAT/Templates+monitors).
 
-After any change you should run `./scripts/auto_update.sh ./` command to make sure all is up to date else the CI pipeline will fail on the branch.
+After any change on this repo, you need to run the `./scripts/auto_update.sh ./` command to make sure all is up to date otherwise the CI pipeline will fail:
+- the parameter will limit the scripts execution on a specific path on the repository
+- on linux system it is possible to run the script directly while `terraform` and `terraform-docs` commands are available in your PATH
+- else you can use [the same docker image as the CI](https://hub.docker.com/r/claranet/datadog-terraform) with docker which is available on every platforms
+
+```
+ docker run --rm -v "$PWD:/work" claranet/datadog-terraform /work/scripts/auto_update.sh ./
+```
 
 ## Important notes ##