[ci] Add yamllint config; lint YAML (#169)

* [client] Add black-compatible isort config
* https://pycqa.github.io/isort/
* https://black.readthedocs.io/en/stable/compatible_configs.html#isort
* [client] Sort all imports with isort
* [client] Add isort to pre-commit hooks
* [ci] Add yamllint config; lint YAML

Co-authored-by: Samuel Hassine <[email protected]>

Author: djds

.circleci/config.yml

@@ -1,3 +1,4 @@
+---
 version: 2.1
 
 jobs:

.github/FUNDING.yml

@@ -1 +1,2 @@
+---
 open_collective: opencti

.pre-commit-config.yaml

@@ -8,6 +8,10 @@ repos:
     rev: 20.8b1
     hooks:
       - id: black
+  - repo: https://github.com/adrienverge/yamllint
+    rev: v1.26.1
+    hooks:
+      - id: yamllint
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v3.3.0
     hooks:

.readthedocs.yml

@@ -1,3 +1,4 @@
+---
 # .readthedocs.yml
 # Read the Docs configuration file
 # See https://docs.readthedocs.io/en/stable/config-file/v2.html for details

.yamllint.yaml

@@ -0,0 +1,8 @@
+---
+extends: default
+rules:
+  indentation:
+    spaces: 2
+    indent-sequences: consistent
+  line-length:
+    level: warning