new implementation for git pull (#218)

* new implementation for git pull

* implemented review comments: use absolute paths

* fixed linting errors and warnings

* fixed spellcheck hints, and ignored one of them

* Update config.json

* Create CHANGELOG.md

* Update Dockerfile

* Create build.json

* add new cli

git_pull/build.json

@@ -0,0 +1,5 @@
+{
+  "args": {
+    "CLI_VERSION": "1.0.1"
+  }
+}