Add initial Docker setup with .dockerignore, Dockerfile, and entrypoint script

entrypoint.sh

@@ -0,0 +1,35 @@
+#!/bin/sh
+
+set -e
+
+CONFIG_FILE="/usr/src/app/config/docker.json"
+
+# Falls Verzeichnis noch nicht existiert
+mkdir -p /usr/src/app/config
+
+# Falls docker.json noch nicht existiert
+if [ ! -f "$CONFIG_FILE" ]; then
+  echo "Creating docker.json from environment..."
+
+  cat > "$CONFIG_FILE" <<EOF
+{
+  "host": "${HB_HOST}",
+  "port": ${PORT},
+  "naturalCritURL": "${HB_NATURALCRIT_URL}",
+  "secret": "${HB_SECRET}",
+  "enableV3": ${HB_ENABLE_V3:-false},
+  "enableThemes": ${HB_ENABLE_THEMES:-false},
+  "localEnvironments": "${HB_LOCAL_ENVIRONMENTS}",
+  "publicUrl": "${HB_PUBLIC_URL}",
+  "images": ${HB_IMAGES:-null},
+  "fonts": ${HB_FONTS:-null}
+}
+EOF
+
+else
+  echo "docker.json already exists, skipping creation."
+fi
+
+# Start Homebrewery
+echo "Starting Homebrewery..."
+exec /tini -s -g -- node --experimental-require-module "$@" server.js