[mod] make run: start granian server and versioning by Dependabot (#5037)

The new ``requirements-server.txt`` (granian) is installed into the virtualenv
of Dockerfile.

When ``make run`` is called, a granian server is started with auto reload on
application's files changes / requires granian[reload] extra, see
``requirements-dev.txt``.

Dependabot supports updates to any ``.txt`` file [1].

[1] https://docs.github.com/en/code-security/dependabot/ecosystems-supported-by-dependabot/supported-ecosystems-and-repositories#pip-and-pip-compile

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

manage

@@ -126,7 +126,20 @@ webapp.run() {
         sleep 3
         xdg-open http://127.0.0.1:8888/
     )&
-    SEARXNG_DEBUG=1 pyenv.cmd python -m searx.webapp
+    SEARXNG_DEBUG=1 \
+        GRANIAN_RELOAD="true" \
+        GRANIAN_RELOAD_IGNORE_WORKER_FAILURE="true" \
+        GRANIAN_RELOAD_PATHS="./searx" \
+        GRANIAN_PROCESS_NAME="searxng" \
+        GRANIAN_INTERFACE="wsgi" \
+        GRANIAN_HOST="::" \
+        GRANIAN_PORT="8888" \
+        GRANIAN_WEBSOCKETS="false" \
+        GRANIAN_LOOP="uvloop" \
+        GRANIAN_BLOCKING_THREADS="4" \
+        GRANIAN_WORKERS_KILL_TIMEOUT="30" \
+        GRANIAN_BLOCKING_THREADS_IDLE_TIMEOUT="300" \
+        pyenv.cmd granian searx.webapp:app
 }
 
 # shellcheck disable=SC2119