Close docker client (#789)

* Close docker client!

* Fix nil dereference

* Update run_context.go

* Bump

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

pkg/container/docker_build.go

@@ -38,6 +38,7 @@ func NewDockerBuildExecutor(input NewDockerBuildExecutorInput) common.Executor {
 		if err != nil {
 			return err
 		}
+		defer cli.Close()
 
 		logger.Debugf("Building image from '%v'", input.ContextDir)