Add eslint

Author: gberaudo

.eslintignore

@@ -0,0 +1 @@
+*.d.ts

.github/workflows/test.yml

@@ -13,5 +13,7 @@ jobs:
       - uses: actions/setup-node@v3
         with:
           node-version: 18
+      - name: Lint
+        run: npm run lint
       - name: Pseudo release
         run: buildtools/release.sh

package.json

@@ -9,6 +9,7 @@
     "build-umd": "cross-env NODE_ENV=production TARGET=umd webpack --progress --bail",
     "start": "cross-env DEV_SERVER=1 NODE_ENV=development TARGET=examples webpack serve --port 3000 --progress --bail --static-directory .",
     "typecheck": "tsc --pretty",
+    "lint": "eslint src",
     "doc": "typedoc --name ol-cesium --excludeExternals --out dist/apidoc --entryPoints src/index.library.js --tsconfig ./tsconfig.json"
   },
   "main": "./dist/olcesium.js",