Enhancement: add a built-in redis to docker image

Dockerfile

@@ -96,6 +96,7 @@ ARG RUNTIME_PACKAGES="\
   tesseract-ocr-spa \
   unpaper \
   pngquant \
+  redis \
   jbig2dec \
   # lxml
   libxml2 \

docker/docker-prepare.sh

@@ -53,6 +53,11 @@ wait_for_mariadb() {
 	done
 }
 
+start_redis() {
+	echo "Starting Redis Server"
+	redis-server &
+}
+
 wait_for_redis() {
 	# We use a Python script to send the Redis ping
 	# instead of installing redis-tools just for 1 thing
@@ -103,6 +108,11 @@ do_work() {
 		wait_for_postgres
 	fi
 
+	if [[ -n "${PAPERLESS_START_REDIS}" ]]; then
+		export PAPERLESS_REDIS="redis://localhost:6379"
+		start_redis
+	fi
+
 	wait_for_redis
 
 	migrations

docs/configuration.md

@@ -1405,6 +1405,17 @@ one pod).
 
     Defaults to 8000.
 
+
+#### [`PAPERLESS_START_REDIS`](#PAPERLESS_START_REDIS) {#PAPERLESS_START_REDIS}
+
+: Set to non-empty to start a built-in redis server inside the container.
+This option will override the `PAPERLESS_REDIS` option.
+
+    This option has no effect when not using Docker.
+
+    Defaults to '' (do not run built-in redis).
+
+
 #### [`USERMAP_UID=<uid>`](#USERMAP_UID) {#USERMAP_UID}
 
 : The ID of the paperless user in the container. Set this to your