Add Flake8 config and update linter workflow settings

Introduce a `.flake8` configuration file to enforce linting rules and conventions. Updated the linter workflow to use this config, adjust default branch to `main`, and set full git history fetch for accurate file tracking. Disabled unnecessary validations to streamline the linting process.

Author: frunika

.flake8

@@ -0,0 +1,7 @@
+[flake8]
+max-line-length=88
+docstring-convention=google
+extend-ignore=E203
+exclude=
+	venv
+	.venv

.github/workflows/linter.yml

@@ -7,25 +7,32 @@ name: super-linter
 
 on: pull_request
 
+permissions: read-all
+
 jobs:
   lint:
     name: Lint many languages with super-linter
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Code
         uses: actions/checkout@v4
+        with:
+          # super-linter needs the full git history to get the
+          # list of files that changed across commits
+          fetch-depth: 0
       - name: Lint Code Base
         uses: github/super-linter/slim@v7
         env:
           VALIDATE_ALL_CODEBASE: false
-          DEFAULT_BRANCH: master
+          DEFAULT_BRANCH: main
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          VALIDATE_GO_RELEASER: false
           VALIDATE_PYTHON_PYLINT: false
           VALIDATE_PYTHON_MYPY: false
           VALIDATE_JSCPD: false
           VALIDATE_PYTHON_BLACK: false
 
           LINTER_RULES_PATH: /
-          PYTHON_FLAKE8_CONFIG_FILE: setup.cfg
+          PYTHON_FLAKE8_CONFIG_FILE: .flake8
           PYTHON_ISORT_CONFIG_FILE: setup.cfg
           YAML_CONFIG_FILE: .yamllint.yaml