File not found in Gitlab-CI - continuous-integration

Question

I've already seen this question/answer here, but the solution isn't working for a Flutter project I'm working on.
Here's my yaml file:
image: cirrusci/flutter
variables:
before_script:
- flutter channel beta
- flutter upgrade
stages:
# - build
- test
#build:
# stage: build
# script:
# - flutter build apk
unitTests:
stage: test
script:
# - ls -la /opt/application/
# - ls -la ~/
- bash -c "echo \"$APP_VARS\" > ./cfg/env.json"
- flutter test test/widget_test.dart
Which yielded a cannot access <filename/directory>: File or Directory Not Found error with both ls -la /opt/application/ and bash -c "echo \"$APP_VARS\" > ./cfg/env.json"
Her's the output from ls -la ~/:
$ ls -la ~/
total 72
drwxr-xr-x. 1 cirrus cirrus 4096 Jul 9 19:16 .
drwxr-xr-x. 1 root root 4096 Mar 7 2018 ..
drwxr-xr-x. 1 cirrus cirrus 4096 Jul 9 19:17 .android
-rw-r--r--. 1 cirrus cirrus 220 May 15 2017 .bash_logout
-rw-r--r--. 1 cirrus cirrus 3526 May 15 2017 .bashrc
-rw-r--r--. 1 cirrus cirrus 24 Jul 9 19:16 .flutter
-rw-r--r--. 1 cirrus cirrus 675 May 15 2017 .profile
drwxr-xr-x. 1 cirrus cirrus 4096 Jul 9 19:16 .pub-cache
drwxr-xr-x. 1 cirrus cirrus 4096 Jul 9 19:16 sdks
My intent is to inject environment variables via the CI for use during testing (and hopefully deployment, although I haven't gotten that far yet).

Answer 1

The solution is two-part:
First, the /builds/**/cfg/ directory actually didn't exist. To fix this, you have two options-- do a mkdir or commit/push a file in the repo. I added an empty .gitignore to my cfg directory.
Then, that yielded a Permission Denied error. To solve this, I first tried to sudo my commands (which let me perform the mkdir mentioned above). When that didn't work, I did a chmod -R 777 /builds/, and that fixed my issue.
Going forward, I plan to use chmod [-R] 644 or chmod [-R] 755 instead and do a chmod +x on any files I need to run via a shell script.
I also moved my environment configuration script to the before_script: section in the gitlab YAML, but I don't believe that was necessary.
See for info on chmod.