chore: store build cache for nextjs (solana-foundation#529)

## Description

This PR adds caching for nextjs into CI

## Type of change

-   [x] Other (please describe): CI improvement


## Checklist

-   [x] My code follows the project's style guidelines
-   [x] I have added tests that prove my fix/feature works
-   [x] All tests pass locally and in CI
-   [x] CI/CD checks pass

<!-- ELLIPSIS_HIDDEN -->

----

> [!IMPORTANT]
> Adds caching to Next.js builds in CI workflow to improve build times
by storing dependencies and build artifacts.
> 
>   - **CI Improvement**:
> - Adds caching to `ci.yaml` for Next.js builds using
`actions/cache@v4`.
>     - Caches `~/.pnpm-store` and `.next/cache` directories.
> - Cache key includes OS, `package-lock.json`, and TypeScript files
hash.
>     - Adds restore-keys for partial cache hits.
> 
> <sup>This description was created by </sup>[<img alt="Ellipsis"
src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=solana-foundation%2Fexplorer&utm_source=github&utm_medium=referral)<sup>
for bde26eb. It will automatically
update as commits are pushed.</sup>

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Author: rogaldh

.browserslistrc

@@ -0,0 +1,9 @@
+[production]
+>0.2% and supports bigint and not dead
+not op_mini all
+
+[development]
+last 1 chrome version
+last 1 firefox version
+last 1 safari version
+supports bigint

.github/workflows/ci.yaml

@@ -6,6 +6,11 @@ on:
   pull_request:
     branches: [master]
 
+env:
+  # cash folder for pnpm_store, nextjs and playwright later on
+  PW_CACHE_AFFIX: pw
+  PW_CACHE_FOLDER: ~/.cache/ms-playwright
+
 jobs:
   Build-And-Test:
     runs-on: ubuntu-latest
@@ -29,6 +34,21 @@ jobs:
           node-version: ${{ matrix.node-version }}
           cache: 'pnpm'
 
+      - name: Setup pnpm config
+        run: pnpm config set store-dir $PNPM_CACHE_FOLDER
+
+      - name: Setup Cache
+        uses: actions/cache@v4
+        id: pnpm_store_cache
+        with:
+          path: |
+            ${{ env.PW_CACHE_FOLDER }}
+            ${{ github.workspace }}/.next/cache
+          key: ${{ runner.os }}-${{ env.PW_CACHE_AFFIX }}-${{ hashFiles('**/pnpm-lock.yaml') }}-${{ hashFiles('**/.browserslistrc') }}-${{ hashFiles('**/*.ts', '**/*.tsx') }}
+          restore-keys: |
+            ${{ runner.os }}-${{ env.PW_CACHE_AFFIX }}-
+            ${{ runner.os }}-${{ env.PW_CACHE_AFFIX }}-${{ hashFiles('**/pnpm-lock.yaml') }}-
+
       - name: Install dependencies
         run: pnpm install
 

package.json

@@ -118,20 +118,8 @@
         "tailwindcss": "3.4.17",
         "vitest": "^3.0.8"
     },
-    "browserslist": {
-        "production": [
-            ">0.2% and supports bigint and not dead",
-            "not op_mini all"
-        ],
-        "development": [
-            "last 1 chrome version",
-            "last 1 firefox version",
-            "last 1 safari version",
-            "supports bigint"
-        ]
-    },
     "engines": {
-        "node": "v20.19"
+        "node": "^18.20 || ^20.19"
     },
     "pnpm": {
         "overrides": {