allow ./.github/actions first party action syntax exception to linter rule (#55963)

Author: rsese

src/content-linter/lib/linting-rules/third-party-action-pinning.js

@@ -9,7 +9,7 @@ const actionRegex = /[\w-]+\/[\w-]+@[\w-]+/
 // Detects a full-length commit SHA (40 hexadecimal characters)
 const shaRegex = /[\w-]+\/[\w-]+@[0-9a-fA-F]{40}/
 // Detects first-party actions
-const firstPartyPrefixes = ['actions/', 'github/', 'octo-org/', 'OWNER/']
+const firstPartyPrefixes = ['actions/', './.github/actions/', 'github/', 'octo-org/', 'OWNER/']
 
 export const thirdPartyActionPinning = {
   names: ['GHD041', 'third-party-action-pinning'],

src/content-linter/tests/unit/third-party-action-pinning.js

@@ -11,7 +11,7 @@ describe(thirdPartyActionPinning.names.join(' - '), () => {
       '  build:',
       '    runs-on: ubuntu-latest',
       '    steps:',
-      '      - uses: actions/javascript-action@main',
+      '      - uses: ./.github/actions/javascript-action@main',
       '```',
     ].join('\n')
     const result = await runRule(thirdPartyActionPinning, { strings: { markdown } })