Update build.yml to run on PR.

.github/workflows/build.yml

@@ -1,10 +1,12 @@
 name: Build ISO
 
 on:
+  pull_request:
+    branches:
+      - main
   workflow_dispatch:
   schedule:
-    # Run the workflow every day at midnight
-    - cron: 0 0 * * *
+    - cron: '0 0 * * *'  # Run the workflow every day at midnight
 
 jobs:
   build:
@@ -22,23 +24,23 @@ jobs:
         run: |
           set -e
           docker exec arch-container bash -c "
-          pacman -Syu --noconfirm &&
-          pacman -S --noconfirm git archiso grub &&
-          cd /workdir &&
-          mkarchiso -v -w workdir/ -o out/ .
+            pacman -Syu --noconfirm &&
+            pacman -S --noconfirm git archiso grub &&
+            cd /workdir &&
+            mkarchiso -v -w workdir/ -o out/ .
           "
 
       - name: Rename ISO to Arch.iso
         run: |
           set -e
           docker exec arch-container bash -c "
-          iso_file=\$(ls /workdir/out/*.iso 2>/dev/null | head -n 1) &&
-          [ -n \"\$iso_file\" ] && mv \$iso_file /workdir/out/Arch.iso || echo 'No ISO file found.'
+            iso_file=\$(ls /workdir/out/*.iso 2>/dev/null | head -n 1) &&
+            [ -n \"\$iso_file\" ] && mv \$iso_file /workdir/out/Arch.iso || echo 'No ISO file found.'
           "
 
       - name: List ISO files
         run: |
-          docker exec arch-container bash -c "ls -l /workdir/out/ || echo 'Failed to list files.'"
+          docker exec arch-container bash -c "ls -l /workdir/out/" || echo 'Failed to list files.'
 
       - name: Copy ISO to Host
         run: |
@@ -48,7 +50,7 @@ jobs:
         id: date
         run: echo "date=$(date +'%Y-%m-%d')" >> $GITHUB_OUTPUT
 
-      # Create a release on GitHub using Personal Access Token (PAT)
+      # Create a release on GitHub using GITHUB_TOKEN
       - name: Create GitHub Release
         id: create_release  # Adding an ID to reference the release step
         uses: actions/[email protected]