fail CI on lint warnings (#774)

Author: mythmon

.github/workflows/test.yml

@@ -23,7 +23,7 @@ jobs:
       - run: yarn test:tsc
       - run: |
           echo ::add-matcher::.github/eslint.json
-          yarn run eslint src test --format=compact
+          yarn run eslint src test --format=compact --max-warnings=0
       - run: yarn test:prettier
       - uses: actions/upload-artifact@v3
         if: failure()

package.json

@@ -29,7 +29,7 @@
     "test": "yarn test:mocha && yarn test:tsc && yarn test:lint && yarn test:prettier",
     "test:coverage": "c8 yarn test:mocha",
     "test:mocha": "rm -rf test/.observablehq/cache test/input/build/*/.observablehq/cache && OBSERVABLE_TELEMETRY_DISABLE=1 TZ=America/Los_Angeles tsx --no-warnings=ExperimentalWarning ./node_modules/.bin/mocha 'test/**/*-test.*'",
-    "test:lint": "eslint src test",
+    "test:lint": "eslint src test --max-warnings=0",
     "test:prettier": "prettier --check src test",
     "test:tsc": "tsc --noEmit",
     "observable": "tsx --no-warnings=ExperimentalWarning ./bin/observable.ts"