Coala in docker on mac failed code analysis due to file access issue

Problem
Coala in docker failed code analysis due to file access issue.

I try to execute coala in docker container following by coala tutorial. However, coala did not indicate report and not modify source code as description at this tutorial. http://docs.coala.io/en/latest/Users/Tutorial.html
note: I tried to give “Full Disk Access” to “docker” by Security & Privacy at macOS control panel. but, this problem did not resolve, yet.

Execution Result:
```
$ git clone https://github.com/coala/coala-tutorial
$ cd ./coala-tutorial
$ coala --files=src/\*.c --bears=SpaceConsistencyBear --save
Please enter a value for the setting "use_spaces" (True if spaces are to be used instead of tabs.) needed by SpaceConsistencyBear for section "cli":
True
Executing section cli...
[WARNING][21:43:36] No files matching '/app/src/*.c' were found.
```

Version information:
```
$ tail -n 2 ~/.zshrc
alias coala="docker run -ti --name coaladoc -v $(pwd):/app --workdir=/app coala/base coala"

$ coala --version
0.12.0.dev99999999999999

$ sw_vers
ProductName: Mac OS X
ProductVersion: 10.15.6
BuildVersion: 19G2021

$ docker --version
Docker version 19.03.12, build 48a66213fe
```

permission:

```
$ cd coala-tutorial
$ ll
total 16
-rw-r--r-- 1 eijioga staff 166 Sep 2 11:54 Makefile
-rw-r--r-- 1 eijioga staff 92 Sep 2 11:54 README.md
drwxr-xr-x@ 4 eijioga staff 128 Sep 2 13:10 bears/
drwxr-xr-x@ 4 eijioga staff 128 Sep 15 09:20 src/

$ cd src
$ ll
total 16
-rw-r--r-- 1 eijioga staff 134 Sep 2 11:54 add.py
-rw-r--r-- 1 eijioga staff 153 Sep 2 11:54 main.c
```

Start by reproducing the documented coala command through the shown Docker alias, then inspect whether the host directory is mounted and visible at /app, including the src path. Done means the tutorial command finds src/main.c and produces its report or applies the requested saved changes in the macOS Docker environment.

Written by the indexing model from the issue text.