Feature/automatically create new versions for missing ones

I first created !44 (closed) but I think I think I renamed the branch by mistake so here's a new more up to date merge request.

I used these scripts to create !43 (merged) 🎉

It works quite well. tldr; I scripted what I was doing manually for every new releases to fill unity_versions.yml. It's probably overkill, but it was a good exercise for me as I wanted to improve my python mocking skills a bit :)

• Add the execution of these tests in the generated .gitlab-ci.yml
• Add documentation on how to run these commands
• Include docker-compose from !24 (closed) ❤

Things that can be done later

• Refactor the scripts a little to make it more DRY
• Add the missing tests for the last part of ci-generator/src/check_new_version.py script (even tho it works)

Using this script is mostly optional as one can still create a unity version entry in the unity_versions.yml file by hand.

Example usage (will probably be updated):

python src/check_new_version.py update
git diff

diff --git a/ci-generator/unity_versions.yml b/ci-generator/unity_versions.yml
index 8b13789..5c74071 100644
--- a/ci-generator/unity_versions.yml
+++ b/ci-generator/unity_versions.yml
@@ -1 +1,30 @@
+2017.4.29f1:
+  build: f1
+  dockerfile_name: unitysetup
+  download_url: https://beta.unity3d.com/download/06508aa14ca1/UnitySetup-2017.4.29f1
+  release_notes: https://unity3d.com/unity/whats-new/2017.4.29f1
+  release_url: https://beta.unity3d.com/download/06508aa14ca1/public_download.html
+  sha1: 07da0d1f4b0690ed076ec9a8ba275857835b2a5a
+  underscore: 2017_4_29f1
+  version: 2017.4.29
+
+2018.4.2f1:
+  build: f1
+  dockerfile_name: unitysetup
+  download_url: https://beta.unity3d.com/download/d6fb3630ea75/UnitySetup-2018.4.2f1
+  release_notes: https://unity3d.com/unity/whats-new/2018.4.2f1
+  release_url: https://beta.unity3d.com/download/d6fb3630ea75/public_download.html
+  sha1: 967f3f280ca422a222b58a50850f96e99604aef9
+  underscore: 2018_4_2f1
+  version: 2018.4.2
+
+2019.1.7f1:
+  build: f1
+  dockerfile_name: unitysetup
+  download_url: https://beta.unity3d.com/download/f3c4928e5742/UnitySetup-2019.1.7f1
+  release_notes: https://unity3d.com/unity/whats-new/2019.1.7f1
+  release_url: https://beta.unity3d.com/download/f3c4928e5742/public_download.html
+  sha1: 97432bf2227a6819ae5893d7ce77334b3b65bc41
+  underscore: 2019_1_7f1
+  version: 2019.1.7