fix(ci): correct preinstall skip logic for CI

The original `||`-chained preinstall printed "Skipping preinstall..." in
CI but then ran only-allow anyway because `process.exit(1)` triggers
the `||` operator. CI happened to pass when only-allow was unpinned
(npx resolved it differently), but pinning to @1.2.2 forced a fresh
registry resolve in which only-allow strictly checks
npm_config_user_agent — which, when invoked via npx-inside-pnpm, is
npm's, not pnpm's — and rejects.

The fix matches the script's stated intent: when CI=true, exit 0 so
the `||` does not trigger and only-allow is genuinely skipped. Local
installs continue to fall through and enforce pnpm via only-allow as
before.

Author: AlemTuzlak

package.json

@@ -22,7 +22,7 @@
     "generate-docs": "node scripts/generate-docs.ts",
     "lint:fix": "nx affected --target=lint:fix --exclude=examples/**",
     "lint:fix:all": "pnpm run format && nx run-many --targets=lint --fix",
-    "preinstall": "node -e \"if(process.env.CI == 'true') {console.log('Skipping preinstall...'); process.exit(1)}\" || npx -y only-allow@1.2.2 pnpm",
+    "preinstall": "node -e \"if(process.env.CI === 'true') { console.log('Skipping preinstall...'); process.exit(0); } process.exit(1);\" || npx -y only-allow@1.2.2 pnpm",
     "size": "size-limit",
     "test": "pnpm run test:ci",
     "test:build": "nx affected --target=test:build --exclude=examples/**",