Flatpak is not buildable in docker

.github/workflows/build_artifacts.yml

@@ -26,6 +26,9 @@ jobs:
 
     steps:
 
+      - name: Prepearing environment
+        run: curl -s "https://raw.githubusercontent.com/RetroDECK/components-template/refs/heads/main/automation_tools/install_dependencies.sh" | /bin/bash
+
       - name: Generate a token for Rekku
         if: ${{ github.repository == 'RetroDECK/RetroDECK' }}
         id: generate-rekku-token
@@ -63,21 +66,15 @@ jobs:
 
       - name: "Build flatpak"
         run: |
-          # Pull the Docker image
-          docker pull ebassi/flathub:base
-      
           # Configure Git
           git config --global protocol.file.allow always
       
-          # Run the flatpak build inside the Docker container
-          docker run --rm \
-            -v "${GITHUB_WORKSPACE}:/workspace" \
-            -w /workspace \
-            ghcr.io/retrodeck/retrodeck-builder:latest \
-            --force-clean \
-            --repo="/workspace/artifacts-repo" \
-            "/workspace/artifacts-build-dir" \
-            "${{ inputs.MANIFEST_FILENAME }}"
+          flatpak-builder --user --force-clean \
+            --install-deps-from=flathub \
+            --install-deps-from=flathub-beta \
+            --repo=${GITHUB_WORKSPACE}/artifacts-repo \
+            "${GITHUB_WORKSPACE}/artifacts-build-dir" \
+            net.retrodeck.retrodeck.yml
               
       - name: "Exporting dir tree"
         id: tree

automation_tools/install_dependencies.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+# This script is installing the required dependencies to correctly run the pipeline and build the flatpak
+
+unset pkg_mgr
+
+# rpm-ostree must be checked before dnf because a dnf (wrapper) command also works on rpm-ostree distros (not what we want)
+for potential_pkg_mgr in apt pacman rpm-ostree dnf; do
+  command -v "$potential_pkg_mgr" &> /dev/null && pkg_mgr="$potential_pkg_mgr" && break
+done
+
+case "$pkg_mgr" in
+  apt)
+    sudo add-apt-repository -y ppa:flatpak/stable
+    sudo apt update
+    sudo apt install -y flatpak flatpak-builder p7zip-full xmlstarlet bzip2 curl jq
+    ;;
+  pacman)
+    sudo pacman -Syu --noconfirm flatpak flatpak-builder p7zip xmlstarlet bzip2
+    ;;
+  rpm-ostree)
+    echo "When using a distro with rpm-ostree, you shouldn't build directly on the host. Try using a distrobox."
+    exit 1
+    ;;
+  dnf)
+    sudo dnf install -y flatpak flatpak-builder p7zip p7zip-plugins xmlstarlet bzip2 curl
+    ;;
+  *)
+    echo "Package manager $pkg_mgr not supported. Please open an issue."
+    ;;
+esac
+
+flatpak remote-add --user --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
+flatpak remote-add --user --if-not-exists flathub-beta https://flathub.org/beta-repo/flathub-beta.flatpakrepo