[ci] fix build implementers guide (#6306)

* [ci] fix build implementers guide

* add comment

* rm git fetch from publish-docs

polkadot/scripts/ci/gitlab/pipeline/build.yml

@@ -168,6 +168,9 @@ build-implementers-guide:
     - .docker-env
     - .test-refs
     - .collect-artifacts-short
+  # git depth is set on purpose: https://github.com/paritytech/polkadot/issues/6284
+  variables:
+    GIT_DEPTH:                     0
   script:
     - apt-get -y update; apt-get install -y graphviz
     - cargo install mdbook mdbook-mermaid mdbook-linkcheck mdbook-graphviz mdbook-last-changed

polkadot/scripts/ci/gitlab/pipeline/publish.yml

@@ -153,8 +153,6 @@ publish-rustdoc:
   extends:
     - .kubernetes-env
   image:                           paritytech/tools:latest
-  variables:
-    GIT_DEPTH:                     100
   rules:
     - if: $CI_PIPELINE_SOURCE == "pipeline"
       when: never