docs: specify ini to insecure registry inputs

Author: NikitaCOEUR

.github/workflows/docker-build-images.yml

@@ -98,9 +98,11 @@ on: # yamllint disable-line rule:truthy
           Inline BuildKit daemon configuration.
           See https://github.com/docker/setup-buildx-action#inputs.
           Example for insecure registry:
+            ```ini
             [registry."my-registry.local:5000"]
               http = true
               insecure = true
+            ```
         type: string
         required: false
       cache-registry:

actions/docker/build-image/action.yml

@@ -108,9 +108,11 @@ inputs:
       Inline BuildKit daemon configuration.
       See https://github.com/docker/setup-buildx-action#inputs.
       Example for insecure registry:
+        ```ini
         [registry."my-registry.local:5000"]
           http = true
           insecure = true
+        ```
     required: false
   multi-platform:
     description: |