fix(lab03): improve CI workflows and documentation

- Fix codecov action file path (app_python/coverage.xml)
- Add CODECOV_TOKEN secret to codecov action
- Fix Snyk actions with proper file paths for both Python and Go
- Add Go CI status badge to app_go/README.md
- Fix codecov badge URL in app_python/README.md (remove token param)

All Lab03 requirements verified:
- 15 unit tests passing with 80% coverage
- Matrix builds for Python 3.11/3.12
- Snyk security scanning configured
- CalVer versioning implemented
- Path filters for monorepo

Author: pepega

.github/workflows/go-ci.yml

@@ -127,7 +127,7 @@ jobs:
         env:
           SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
         with:
-          args: --severity-threshold=high
+          args: --file=app_go/go.mod --severity-threshold=high
 
   # ==========================================================================
   # Job 4: Build and Push Docker Image

.github/workflows/python-ci.yml

@@ -74,10 +74,11 @@ jobs:
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v4
         with:
-          file: ./coverage.xml
+          file: app_python/coverage.xml
           flags: unittests
           name: codecov-${{ matrix.python-version }}
           fail_ci_if_error: false
+          token: ${{ secrets.CODECOV_TOKEN }}
 
   # ========================================
   # Job 2: Security Scanning with Snyk
@@ -111,7 +112,7 @@ jobs:
         env:
           SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
         with:
-          args: --severity-threshold=medium
+          args: --file=app_python/requirements.txt --severity-threshold=medium
 
   # ========================================
   # Job 3: Build and Push Docker Image

app_go/README.md

@@ -1,5 +1,7 @@
 # Go DevOps Info Service
 
+[![Go CI](https://github.com/pepegx/DevOps-Core-Course/actions/workflows/go-ci.yml/badge.svg)](https://github.com/pepegx/DevOps-Core-Course/actions/workflows/go-ci.yml)
+
 > A Go implementation of the DevOps Info Service providing system information and health checks via HTTP.
 
 ## Overview

app_python/README.md

@@ -1,7 +1,7 @@
 # DevOps Info Service
 
 [![Python CI](https://github.com/pepegx/DevOps-Core-Course/actions/workflows/python-ci.yml/badge.svg)](https://github.com/pepegx/DevOps-Core-Course/actions/workflows/python-ci.yml)
-[![codecov](https://codecov.io/gh/pepegx/DevOps-Core-Course/branch/lab03/graph/badge.svg?token=CODECOV_TOKEN)](https://codecov.io/gh/pepegx/DevOps-Core-Course)
+[![codecov](https://codecov.io/gh/pepegx/DevOps-Core-Course/graph/badge.svg)](https://codecov.io/gh/pepegx/DevOps-Core-Course)
 
 > A web service that provides comprehensive system and runtime information for DevOps monitoring and diagnostics.