Skip linter-check for readmes (#4794)

* Exclude readmes from the linter
* Add env variable with exclusion to the linter yml
* Rename Ubuntu readmes to correspond with the other images
* Remove trailing space in ubuntu software generator
* Rename Ubuntu1804-README.md to Ubuntu1804-Readme.md
* Rename Ubuntu2004-README.md to Ubuntu2004-Readme.md

.github/workflows/linter.yml

@@ -29,6 +29,7 @@ jobs:
           VALIDATE_JSON: true
           VALIDATE_MARKDOWN: true
           DEFAULT_BRANCH: ${{ github.base_ref }}
+          FILTER_REGEX_EXCLUDE: .*images/*/.*-Readme.md
 
       - name: Checking shebang lines in MacOS and Ubuntu releases.
         run: ./images.CI/shebang-linter.ps1

images/linux/ubuntu1804.json

@@ -335,7 +335,7 @@
         {
             "type": "file",
             "source": "{{user `image_folder`}}/Ubuntu-Readme.md",
-            "destination": "{{template_dir}}/Ubuntu1804-README.md",
+            "destination": "{{template_dir}}/Ubuntu1804-Readme.md",
             "direction": "download"
         },
         {

images/linux/ubuntu2004.json

@@ -336,7 +336,7 @@
         {
             "type": "file",
             "source": "{{user `image_folder`}}/Ubuntu-Readme.md",
-            "destination": "{{template_dir}}/Ubuntu2004-README.md",
+            "destination": "{{template_dir}}/Ubuntu2004-Readme.md",
             "direction": "download"
         },
         {