fix: Update-Skript, Containerfile-Optimierungen und chunkah-Rechunking

- notify-bootc-user.sh: D-Bus-Umgebung korrekt fuer Systemd-Service,
  jq-basierter Staging-Check (.status.staged != null), Guard Clauses,
  -Variable entfernt
- Containerfile: COPY --chmod=755 fuer Skript-Permissions
- build/20-multimedia.sh: Redundantes dnf5 clean all entfernt
- build/30-virt.sh: dnf5 autoremove und Cleanup entfernt
- build/40-remove-packages.sh: || true entfernt (Fehler sichtbar machen)
- build/50-prepare-flatpak-for-bazaar.sh: curl -f --retry 3 hinzugefuegt
- build.yml: chunkah Rechunk-Step fuer content-based Layers (Delta-Updates),
  Cache-Key erweitert (scripts/**), continue-on-error entfernt
- build-installer-iso.yml: concurrency-Block hinzugefuegt

build/20-multimedia.sh

@@ -31,7 +31,4 @@ dnf5 install -y @multimedia
 #  rocm-runtime
  
   
-# --- 2. Die sofortige Bereinigung (WICHTIG!) ---
-echo "Cleaning up this layer..."
-dnf5 clean all || true
-rm -rf /tmp/* /var/tmp/* || true
+

build/30-virt.sh

@@ -22,9 +22,5 @@ dnf5 install -y \
   micro \
   fuse-libs
   
-# --- 2. Die sofortige Bereinigung (WICHTIG!) ---
-echo "Cleaning up this layer..."
-dnf5 clean all || true
-dnf5 autoremove -y || true
-rm -rf /tmp/* /var/tmp/* || true
+
 

build/40-remove-packages.sh

@@ -11,7 +11,7 @@ dnf5 remove -y \
   firefox-langpacks* \
   plasma-discover \
   plasma-discover-flatpak \
-  plasma-discover-notifier || true
+  plasma-discover-notifier
 
   rm -f /etc/xdg/autostart/org.kde.discover.notifier.desktop
   

build/50-prepare-flatpak-for-bazaar.sh

@@ -3,4 +3,4 @@ set -oue pipefail
 
 echo "Downloading Flathub repository definition..."
 mkdir -p /usr/share/flatpak/remotes.d/
-curl -o /usr/share/flatpak/remotes.d/flathub.flatpakrepo https://dl.flathub.org/repo/flathub.flatpakrepo
+curl -f --retry 3 --retry-delay 5 -o /usr/share/flatpak/remotes.d/flathub.flatpakrepo https://dl.flathub.org/repo/flathub.flatpakrepo