ci: Complete dev container configuration (#3052)

run.sh

@@ -113,31 +113,8 @@ fi
 
 # Set theme if insiders
 if $insiders ; then
-  random_num=$RANDOM
   export BUILD_INSIDERS=true
-  cmd_flags+=("--config-file=$PWD/.mkdocs-insiders-$random_num.yml")
-  touch "$PWD/.mkdocs-insiders-$random_num.yml"
-  cat <<EOT >> "$PWD/.mkdocs-insiders-$random_num.yml"
-INHERIT: mkdocs.yml
-
-watch:
-  - theme
-  - includes
-  - mkdocs.yml
-
-markdown_extensions:
-  material.extensions.preview:
-    sources:
-      exclude:
-        - index.md
-        - tools.md
-        - about.md
-        - about/*
-    targets:
-      exclude:
-        - about/contributors.md
-EOT
-  trap 'rm $PWD/.mkdocs-insiders-$random_num.yml' EXIT
+  cmd_flags+=("--config-file=$PWD/mkdocs.insiders.yml")
 fi
 
 # Run the command with the specified language