Add CI for better error catching

.github/actions/setup-project/action.yml

@@ -0,0 +1,24 @@
+name: Setup Project
+description: Installs Node.js, NPM and dependencies and sets up the project
+
+inputs:
+  DECRYPTION_SECRET:
+    description: The secret used to decrypt the files
+    required: true
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Setup node
+      uses: actions/setup-node@v4
+      with:
+        node-version-file: 'package.json'
+        cache: 'npm'
+
+    - name: Install dependencies
+      shell: bash
+      run: npm ci --prefer-offline --no-audit --progress=false
+
+    - uses: amplium/git-crypt-action@master
+      with:
+        key_encoded: ${{ inputs.DECRYPTION_SECRET }}

.github/workflows/ci.yml

@@ -0,0 +1,44 @@
+name: Continuous Integration
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    timeout-minutes: 15
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup project
+        uses: ./.github/actions/setup-project
+        with:
+          DECRYPTION_SECRET: ${{ secrets.DECRYPTION_SECRET }}
+
+      - run: npm run eslint:quiet
+
+  prettier:
+    runs-on: ubuntu-latest
+
+    timeout-minutes: 15
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup project
+        uses: ./.github/actions/setup-project
+        with:
+          DECRYPTION_SECRET: ${{ secrets.DECRYPTION_SECRET }}
+
+      - run: npm run prettier:check

package.json

@@ -11,8 +11,8 @@
     "puppeteer-extra-plugin-stealth": "^2.11.2"
   },
   "engines": {
-    "node": "18.x",
-    "npm": "9.x"
+    "node": "20.x",
+    "npm": "10.x"
   },
   "devDependencies": {
     "eslint": "^8.55.0",
@@ -25,7 +25,10 @@
   "scripts": {
     "start-booker": "node add-to-cart.mjs",
     "start-checker": "node check-for-changes.mjs",
+    "prettier:check": "prettier --check .",
     "prettier:write": "prettier --write .",
-    "eslint:fix": "eslint . --ignore-path .gitignore --ext .mjs,.js --fix"
+    "eslint": "eslint . --ignore-path .gitignore --ext .mjs,.js",
+    "eslint:quiet": "npm run eslint -- --quiet",
+    "eslint:fix": "npm run eslint --fix"
   }
 }