add stylelint-value-no-unknown-custom-properties

.stylelintrc.yaml

@@ -1,6 +1,7 @@
 plugins:
  - stylelint-declaration-strict-value
  - stylelint-declaration-block-no-ignored-properties
+ - stylelint-value-no-unknown-custom-properties
  - "@stylistic/stylelint-plugin"
 
 ignoreFiles:
@@ -114,6 +115,7 @@ rules:
  comment-pattern: null
  comment-whitespace-inside: null
  comment-word-disallowed-list: null
+ csstools/value-no-unknown-custom-properties: [true, importFrom: [web_src/css/base.css, web_src/css/themes/theme-gitea-light.css, web_src/css/themes/theme-gitea-dark.css]]
  custom-media-pattern: null
  custom-property-empty-line-before: null
  custom-property-no-missing-var-function: true

package.json

@@ -90,6 +90,7 @@
  "stylelint": "16.2.1",
  "stylelint-declaration-block-no-ignored-properties": "2.8.0",
  "stylelint-declaration-strict-value": "1.10.4",
+ "stylelint-value-no-unknown-custom-properties": "6.0.1",
  "svgo": "3.2.0",
  "updates": "15.3.1",
  "vite-string-plugin": "1.1.5",