[Nginx] Use jinja2 for templating nginx configuration

data/Dockerfiles/nginx/docker-entrypoint.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+until ping ${REDISHOST} -c1 > /dev/null; do
+  echo "Waiting for Redis..."
+  sleep 1
+done
+until ping ${PHPFPMHOST} -c1 > /dev/null; do
+  echo "Waiting for PHP..."
+  sleep 1
+done
+if printf "%s\n" "${SKIP_SOGO}" | grep -E '^([yY][eE][sS]|[yY])+$' >/dev/null; then
+  until ping ${SOGOHOST} -c1 > /dev/null; do
+    echo "Waiting for SOGo..."
+    sleep 1
+  done
+fi
+if printf "%s\n" "${SKIP_RSPAMD}" | grep -E '^([yY][eE][sS]|[yY])+$' >/dev/null; then
+  until ping ${RSPAMDHOST} -c1 > /dev/null; do
+    echo "Waiting for Rspamd..."
+    sleep 1
+  done
+fi
+
+python3 /bootstrap.py
+
+exec "$@"