[ci] #165: Run checks by calling directly the tools without the makefile

Without 'poetry run', which uses the tools installed on the image
To get rid of the makefile

.gitlab-ci.yml

@@ -32,7 +32,7 @@ format:
     - .code_changes
   stage: checks
   script:
-    - make check-format
+    - black --check duniterpy tests examples
 
 build:
   extends:
@@ -53,7 +53,7 @@ type:
     - .code_changes
   stage: checks
   script:
-    - make mypy
+    - mypy duniterpy tests examples --ignore-missing-imports
 
 lint:
   extends:
@@ -61,7 +61,7 @@ lint:
   stage: checks
   tags: [redshift]
   script:
-    - make pylint
+    - pylint duniterpy tests examples
 
 .tests:
   extends: .changes