ci: adapt to SE-managed .eslintrc.cjs (#83)

Our old config was almost the same -- only that it also ran eslint on
typescript in markdown files, only our README.md. Now, we're
importing the SE-managed file, add our overrides, and use that
config (.eslintrc.styra.cjs) in CI.

Signed-off-by: Stephan Renatus <stephan@styra.com>

Author: srenatus

.eslintrc.js

@@ -0,0 +1,21 @@
+/* eslint-env node */
+const seConfig = require("./.eslintrc.cjs");
+module.exports = {
+  ...seConfig,
+  plugins: ["@typescript-eslint", "markdown"],
+  overrides: [
+    {
+      files: ["**/*.md"],
+      processor: "markdown/markdown",
+    },
+    {
+      // 1. Target ```ts code blocks in .md files.
+      files: ["**/*.md/*.ts"],
+      rules: {
+        // 2. Disable other rules.
+        "no-console": "off",
+        "import/no-unresolved": "off",
+      },
+    },
+  ],
+};

.eslintrc.styra.cjs

@@ -17,10 +17,9 @@ jobs:
         with:
           node-version: 21
       - name: Compile and Test
-        working-directory: ./
         run: |
           npm ci
-          npx eslint --max-warnings=0 src README.md
+          npx eslint --config=.eslintrc.styra.cjs --max-warnings=0 src README.md
           npx prettier . --check
           npx typedoc
           node --import tsx --test tests/**/*.ts