docs(refactor): rename prepare environment section

Signed-off-by: Evgeniy Frolov <evgeniy.frolov@flant.com>

bin/configurator/static/_includes/en/configurator/partials/ci/buildah_ubuntu.md.liquid

@@ -0,0 +1,7 @@
+### Setting up the build environment with Buildah
+
+(For Ubuntu 23.10 and later) on the GitLab Runner host run:
+
+```shell
+{ echo "kernel.apparmor_restrict_unprivileged_userns = 0" && echo "kernel.apparmor_restrict_unprivileged_unconfined = 0";} | sudo tee -a /etc/sysctl.d/20-apparmor-donotrestrict.conf && sudo sysctl -p /etc/sysctl.d/20-apparmor-donotrestrict.conf
+```

bin/configurator/static/_includes/en/configurator/partials/ci/gitlab_docker_main_section.md.liquid

@@ -6,13 +6,7 @@
 
   - [Docker Engine](https://docs.docker.com/engine/install/).
 
-### Prepare the environment
-
-(For Ubuntu 23.10 and later) on the GitLab Runner host run:
-
-```shell
-{ echo "kernel.apparmor_restrict_unprivileged_userns = 0" && echo "kernel.apparmor_restrict_unprivileged_unconfined = 0";} | sudo tee -a /etc/sysctl.d/20-apparmor-donotrestrict.conf && sudo sysctl -p /etc/sysctl.d/20-apparmor-donotrestrict.conf
-```
+{% include configurator/partials/ci/buildah_ubuntu.md.liquid %}
 
 ### Installing GitLab Runner
 

bin/configurator/static/_includes/en/configurator/partials/ci/gitlab_kubernetes_main_section.md.liquid

@@ -8,13 +8,7 @@
 
 Follow [official instructions](https://docs.gitlab.com/runner/install/) to install and register the GitLab Runner. If you are going to install your GitLab Runner in Kubernetes, then install it to `gitlab-ci` namespace.
 
-### Prepare the environment
-
-(For Ubuntu 23.10 and later) on the GitLab Runner nodes run:
-
-```shell
-{ echo "kernel.apparmor_restrict_unprivileged_userns = 0" && echo "kernel.apparmor_restrict_unprivileged_unconfined = 0";} | sudo tee -a /etc/sysctl.d/20-apparmor-donotrestrict.conf && sudo sysctl -p /etc/sysctl.d/20-apparmor-donotrestrict.conf
-```
+{% include configurator/partials/ci/buildah_ubuntu.md.liquid %}
 
 ### Basic GitLab Runner configuration (no caching)
 

bin/configurator/static/_includes/en/configurator/tab/ci/argocd-with-gitlab-ci-cd/simple/docker-runner/linux/buildah/infra.md.liquid

@@ -8,13 +8,7 @@
 
 - [Argo CD](https://argo-cd.readthedocs.io/en/stable/getting_started/#1-install-argo-cd).
 
-### Prepare the environment
-
-(For Ubuntu 23.10 and later) on the GitLab Runner host run:
-
-```shell
-{ echo "kernel.apparmor_restrict_unprivileged_userns = 0" && echo "kernel.apparmor_restrict_unprivileged_unconfined = 0";} | sudo tee -a /etc/sysctl.d/20-apparmor-donotrestrict.conf && sudo sysctl -p /etc/sysctl.d/20-apparmor-donotrestrict.conf
-```
+{% include configurator/partials/ci/buildah_ubuntu.md.liquid %}
 
 ### Installing GitLab Runner
 

bin/configurator/static/_includes/en/configurator/tab/ci/argocd-with-gitlab-ci-cd/simple/kubernetes-runner/linux/buildah/infra.md.liquid

@@ -6,13 +6,7 @@
 
 - [Argo CD](https://argo-cd.readthedocs.io/en/stable/getting_started/#1-install-argo-cd).
 
-### Prepare the environment
-
-(For Ubuntu 23.10 and later) on the GitLab Runner nodes run:
-
-```shell
-{ echo "kernel.apparmor_restrict_unprivileged_userns = 0" && echo "kernel.apparmor_restrict_unprivileged_unconfined = 0";} | sudo tee -a /etc/sysctl.d/20-apparmor-donotrestrict.conf && sudo sysctl -p /etc/sysctl.d/20-apparmor-donotrestrict.conf
-```
+{% include configurator/partials/ci/buildah_ubuntu.md.liquid %}
 
 ### Install GitLab Runner
 

bin/configurator/static/_includes/en/configurator/tab/ci/github-actions/simple/docker-runner/linux/buildah/infra.md.liquid

@@ -12,10 +12,4 @@
 
 Install and register GitHub Runner on its dedicated host by following the [official instructions](https://docs.github.com/en/actions/hosting-your-own-runners/managing-self-hosted-runners/adding-self-hosted-runners).
 
-### Setting up the build environment with Buildah
-
-(For Ubuntu 23.10 and later) on the GitHub Runner host run:
-
-```shell
-{ echo "kernel.apparmor_restrict_unprivileged_userns = 0" && echo "kernel.apparmor_restrict_unprivileged_unconfined = 0";} | sudo tee -a /etc/sysctl.d/20-apparmor-donotrestrict.conf && sudo sysctl -p /etc/sysctl.d/20-apparmor-donotrestrict.conf
-```
+{% include configurator/partials/ci/buildah_ubuntu.md.liquid %}

bin/configurator/static/_includes/en/configurator/tab/ci/other-ci-cd-system/simple/docker-runner/linux/buildah/infra.md.liquid

@@ -8,13 +8,7 @@
 
   * [Docker Engine](https://docs.docker.com/engine/install/).
 
-### Prepare the environment
-
-(For Ubuntu 23.10 and later) on the GitLab Runner host run:
-
-```shell
-{ echo "kernel.apparmor_restrict_unprivileged_userns = 0" && echo "kernel.apparmor_restrict_unprivileged_unconfined = 0";} | sudo tee -a /etc/sysctl.d/20-apparmor-donotrestrict.conf && sudo sysctl -p /etc/sysctl.d/20-apparmor-donotrestrict.conf
-```
+{% include configurator/partials/ci/buildah_ubuntu.md.liquid %}
 
 ### Configuring the Runner
 

bin/configurator/static/_includes/en/configurator/tab/ci/other-ci-cd-system/simple/kubernetes-runner/linux/buildah/infra.md.liquid

@@ -4,13 +4,7 @@
 
 - Kubernetes for running CI jobs with your CI system's Kubernetes Runner.
 
-### Prepare the environment
-
-(For Ubuntu 23.10 and later) on the GitLab Runner nodes run:
-
-```shell
-{ echo "kernel.apparmor_restrict_unprivileged_userns = 0" && echo "kernel.apparmor_restrict_unprivileged_unconfined = 0";} | sudo tee -a /etc/sysctl.d/20-apparmor-donotrestrict.conf && sudo sysctl -p /etc/sysctl.d/20-apparmor-donotrestrict.conf
-```
+{% include configurator/partials/ci/buildah_ubuntu.md.liquid %}
 
 ### Basic Runner configuration (no caching)