Revert "Revert "chore(samples): mark samples novalidate (Kotlin#155)""

This reverts commit 9e39a14.

Author: AlexanderPrendota

.github/workflows/verify-samples.yml

@@ -18,7 +18,7 @@ jobs:
         uses: AlexanderPrendota/kotlin-samples-pusher@v1
         with:
           push-repository: 'https://github.com/AlexanderPrendota/kotlin-compiler-server'
-          tag-filter: '#tag="code" & class="language-run-kotlin"'
+          tag-filter: '#tag="code" & class="language-run-kotlin" & !validate="false"'
           push-path: 'src/test/resources/test-compile-data/jvm/kotlin-by-example'
           username: '${{ secrets.KOTLIN_BY_EXAMPLE_TOKEN }}' #token with an access to create PR in push-repository and issue in this repository
 

examples/01_introduction/03_Variables.md

@@ -27,6 +27,7 @@ fun main() {
 //sampleEnd
 }
 ```
+{validate="false"}
 
 1. Declares a variable without initialization.
 2. An attempt to use the variable causes a compiler error: `Variable 'e' must be initialized`.

examples/01_introduction/04_Null Safety.md

@@ -26,6 +26,7 @@ fun main() {
 //sampleEnd
 }
 ```
+{validate="false"}
 
 1. Declares a non-`null` String variable.
 2. When trying to assign `null` to non-nullable variable, a compilation error is produced.