Refactor build configs and improve CI/CD checks

This commit makes the build process more robust, simplifies
configurations and reduce the risk of incomplete or erroneous
deployments.

- Centralize output directory definitions by introducing
  `dist-dirs.json`.
- Add `verify-build-artifacts` utility to ensure correct build outputs
  and `print-dist-dir` to determine distribution directory.
- Add steps in CI/CD pipeline to verify build artifacts.
- Migrate Electron Builder config from YAML to CJS for capability to
  read JSON.
- Fix `release-site.yaml` failing due to pointing to wrong distribution
  directory, change it to use `print-dist-dir`.
- Improve `check-desktop-runtime-errors` to verify build artifacts for
  more reliable builds. Ensure tests fail and succeed reliably.
- Update `.gitignore` and configure ESLint to use it to define and
  ignore build artifact directories from one place, remove
  `.eslintignore` that does not add anything after this change.
- Keep `"main"` field in `package.json` as `electron-vite` depends on it
  (alex8088/electron-vite#270).
- Improve documentation

electron-builder.cjs

@@ -0,0 +1,43 @@
+/* eslint-disable no-template-curly-in-string */
+
+const { join } = require('path');
+const { electronBundled, electronUnbundled } = require('./dist-dirs.json');
+
+module.exports = {
+  // Common options
+  publish: {
+    provider: 'github',
+    vPrefixedTagName: false, // default: true
+    releaseType: 'release', // default: draft
+  },
+  directories: {
+    output: electronBundled,
+  },
+  extraMetadata: {
+    main: join(electronUnbundled, 'main/index.cjs'), // do not `path.resolve`, it expects a relative path
+  },
+
+  // Windows
+  win: {
+    target: 'nsis',
+  },
+  nsis: {
+    artifactName: '${name}-Setup-${version}.${ext}',
+  },
+
+  // Linux
+  linux: {
+    target: 'AppImage',
+  },
+  appImage: {
+    artifactName: '${name}-${version}.${ext}',
+  },
+
+  // macOS
+  mac: {
+    target: 'dmg',
+  },
+  dmg: {
+    artifactName: '${name}-${version}.${ext}',
+  },
+};