techdocs-backend: instantiate containerRunner internally

Signed-off-by: Vincenzo Scamporlino <vincenzos@spotify.com>

plugins/techdocs-backend/src/plugin.ts

@@ -16,7 +16,6 @@
 
 import {
   cacheToPluginCacheManager,
-  DockerContainerRunner,
   loggerToWinstonLogger,
 } from '@backstage/backend-common';
 import {
@@ -36,7 +35,6 @@ import {
   techdocsGeneratorExtensionPoint,
   techdocsPreparerExtensionPoint,
 } from '@backstage/plugin-techdocs-node';
-import Docker from 'dockerode';
 import { createRouter } from '@backstage/plugin-techdocs-backend';
 import * as winston from 'winston';
 
@@ -118,14 +116,9 @@ export const techdocsPlugin = createBackendPlugin({
           preparers.register(protocol, preparer);
         }
 
-        // Docker client (conditionally) used by the generators, based on techdocs.generators config.
-        const dockerClient = new Docker();
-        const containerRunner = new DockerContainerRunner({ dockerClient });
-
         // Generators are used for generating documentation sites.
         const generators = await Generators.fromConfig(config, {
           logger: winstonLogger,
-          containerRunner,
           customGenerator: customTechdocsGenerator,
         });