Remove duplicated build infrastructure tests

.github/workflows/schema-tests.yaml

@@ -33,7 +33,8 @@ jobs:
     - name: Install dependencies
       run: yarn install --immutable
 
-    - name: Run tests
-      run: yarn test
+    - name: Run schema tests
+      if: ${{ hashFiles('tests/schema/schema.test.mjs') != '' }}
+      run: yarn test tests/schema/schema.test.mjs
       env:
         BASE: ${{ github.event.pull_request.base.ref }}

CONTRIBUTING.md

@@ -209,7 +209,7 @@ Before creating a pull request or marking a draft pull request as ready for revi
    | `yarn validate-markdown` | markdownlint + link check only — fast loop while editing |
    | `yarn format-markdown` | auto-fix markdownlint violations |
    | `yarn build-src` | full check: validation, HTML build, schema publish |
-   | `yarn test` | runs the JSON Schema and build tooling test suites |
+   | `yarn test` | runs the JSON Schema test suite on development branches |
 
 5. After `yarn build-src`, open output file `deploy-preview/oas.html` with a browser and check your changes