Bring docker test back

commit 4540ba24c72cb2d24e2e04870025dfa233dedf30
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Sat Mar 14 11:16:13 2020 +0800

    wait longer

commit c8f07b81a7fe5fdef9224e8bc187500c4d67f049
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Sat Mar 14 10:55:49 2020 +0800

    try to Terminate

commit 10d2d4b9d0756cf8f60fe27e1e41ae29b5ea6cbe
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Sat Mar 14 10:50:26 2020 +0800

    forward the error

commit 38c96ee44d31088b9e6de67ebb745358fac8d49a
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Sat Mar 14 10:31:39 2020 +0800

    now enable the assertion

commit 3b3c46a065a035d906d4cc5022d42e30b1f52a08
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Sat Mar 14 10:26:40 2020 +0800

    rm un-related info

commit dd7ef7e3d0a0765c1fc48296d70966b3b4d581dd
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Sat Mar 14 10:12:01 2020 +0800

    print err of provider.Run

commit 49a7b57dbf52d410c0dfe796be9c2f6213884931
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Sat Mar 14 09:55:48 2020 +0800

    wait until it exits

commit a3e8f699072e3252b3300c667f1425a966aedb39
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Sat Mar 14 09:54:19 2020 +0800

    targeting alpine:3.8

commit f30b8565049bb373a1a91a34ad07c8c3df8e1036
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Sat Mar 14 09:47:27 2020 +0800

    see what happens

commit 8c21229a8be8e2ac0737bbc4bb88ba54e9fb7a20
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Sat Mar 14 09:30:50 2020 +0800

    remove one assertion

commit 123368e6ef07aa63c489bb49bdf370d3abdd17bb
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Fri Mar 13 23:32:45 2020 +0800

    docker test somehow works now

commit 94fa294a9bbedb569e6dd9cc7e4f27e73ed97443
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Fri Mar 13 23:27:12 2020 +0800

    should use -d

commit b35bae2a9cb5e006c513da95377ab9487fc4341a
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Fri Mar 13 23:22:25 2020 +0800

    docker run not working??

commit 9aea0036f434d333087f0cff3ce5165a53554e5f
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Fri Mar 13 23:12:39 2020 +0800

    test if docker works

commit f92578b159587a8bbda296bbf9261fb4c5e2f186
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Fri Mar 13 17:42:00 2020 +0800

    debugging docker_test

commit b649e32f76549711af597ce3a642309a41a08bf9
Author: z4yx <z4yx@users.noreply.github.com>
Date:   Fri Mar 13 17:27:55 2020 +0800

    Revert "remove docker_test.go"

    This reverts commit a517a4bb64.

worker/runner.go

@@ -104,7 +104,7 @@ func newCmdJob(provider mirrorProvider, cmdAndArgs []string, workingDir string,
 }
 
 func (c *cmdJob) Start() error {
-	// logger.Debugf("Command start: %v", c.cmd.Args)
+	logger.Debugf("Command start: %v", c.cmd.Args)
 	c.finished = make(chan empty, 1)
 	return c.cmd.Start()
 }