fix: Gitea Traefik routing and connection pool optimization

- Remove middleware reference from Gitea Traefik labels (caused routing issues)
- Optimize Gitea connection pool settings (MAX_IDLE_CONNS=30, authentication_timeout=180s)
- Add explicit service reference in Traefik labels
- Fix intermittent 504 timeouts by improving PostgreSQL connection handling

Fixes Gitea unreachability via git.michaelschiemer.de

scripts/build/build.sh

@@ -0,0 +1,61 @@
+#!/bin/bash
+set -e
+
+echo "🚀 Starting Docker build with network resilience..."
+
+# Prüfe Netzwerk-Konnektivität
+echo "🔍 Checking network connectivity..."
+if ! curl -s --connect-timeout 5 https://registry-1.docker.io/v2/ > /dev/null; then
+    echo "⚠️  Docker Hub nicht erreichbar - verwende lokale Images"
+    export DOCKER_BUILDKIT=0
+    export COMPOSE_DOCKER_CLI_BUILD=0
+fi
+
+# DNS-Cache leeren
+echo "🔄 Flushing DNS cache..."
+sudo systemctl flush-dns 2>/dev/null || sudo systemd-resolve --flush-caches 2>/dev/null || true
+
+# Docker daemon neu starten falls nötig
+if ! docker info > /dev/null 2>&1; then
+    echo "🔄 Restarting Docker daemon..."
+    sudo systemctl restart docker
+    sleep 5
+fi
+
+# Versuche erst mit Pull
+echo "📥 Attempting to pull base images..."
+if timeout 60 docker-compose pull --ignore-pull-failures; then
+    echo "✅ Images pulled successfully"
+else
+    echo "⚠️  Pull failed - building with local images only"
+fi
+
+# Build mit verschiedenen Strategien
+echo "🏗️  Building containers..."
+
+# Strategie 1: Normaler Build
+if timeout 300 docker-compose build --parallel; then
+    echo "✅ Build completed successfully!"
+    exit 0
+fi
+
+echo "⚠️  Normal build failed - trying fallback strategies..."
+
+# Strategie 2: Ohne Cache und Pull
+if timeout 300 docker-compose build --no-cache --pull=false; then
+    echo "✅ Build completed with fallback strategy!"
+    exit 0
+fi
+
+# Strategie 3: Sequenzieller Build
+echo "🔄 Trying sequential build..."
+for service in web php db redis queue-worker; do
+    echo "Building $service..."
+    if timeout 300 docker-compose build --no-cache --pull=false "$service"; then
+        echo "✅ $service built successfully"
+    else
+        echo "❌ Failed to build $service"
+    fi
+done
+
+echo "🏁 Build process completed"