PS4 workflow: Use pacman-package-manager

Switches from `pacbrew-pacman` to vanilla pacman that is now an Ubuntu package (`pacman-package-manager`) starting from Ubuntu 24.04.

pacbrew-pacman from https://github.com/PacBrew/pacbrew-pacman/releases is 2 years old and has the repo URL that no longer works.
With the vanilla pacman, we simply add pacbrew as a repo source with the correct URL.

Refs PacBrew/pacbrew-packages#6 (comment)

.github/workflows/nightly.yml

@@ -706,20 +706,26 @@ jobs:
           - name: hellfire+patch
             cmakeargs: '-D DEVILUTIONX_SYSTEM_SDL2=OFF -DUSE_PATCH=ON -DHELLFIRE=ON'
             artifact: 'hellfire-nightly-ps4p.pkg'
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
     - name: Checkout
       uses: actions/checkout@v4
       with:
         fetch-depth: 0
 
     - name: Create Build Environment
-      run: >
-        sudo apt-get update &&
-        sudo apt-get install -y wget cmake git gettext &&
-        wget https://github.com/PacBrew/pacbrew-pacman/releases/download/v1.1/pacbrew-pacman-1.1.deb &&
-        sudo dpkg -i pacbrew-pacman-1.1.deb && sudo pacbrew-pacman -Sy &&
-        sudo pacbrew-pacman --noconfirm -S ps4-openorbis ps4-openorbis-portlibs &&
+      run: |
+        sudo apt-get update && \
+        sudo apt-get install -y pacman-package-manager wget cmake git gettext && \
+        sudo tee -a /etc/pacman.conf > /dev/null <<TEXT
+        [pacbrew]
+        SigLevel = Optional TrustAll
+        Server = https://pacman.mydedibox.fr/pacbrew/packages/
+        TEXT
+    - name: Setup pacman packages
+      run: |
+        sudo pacman --noconfirm -Sy && \
+        sudo pacman --noconfirm -S ps4-openorbis ps4-openorbis-portlibs && \
         echo "#include <endian.h>" | sudo tee /opt/pacbrew/ps4/openorbis/include/sys/endian.h
 
     - name: Build