feat: add Codecov action to upload test coverage and update README with Codecov badge

Author: wiebe-vandendriessche

.github/workflows/build.yml

@@ -42,5 +42,14 @@ jobs:
         if: ${{ matrix.go-version == '1.25.x' }}
         run: go test ./... -coverprofile=coverage.out -covermode=atomic
 
+      - name: Upload coverage to Codecov
+        if: ${{ matrix.go-version == '1.25.x' }}
+        uses: codecov/codecov-action@v4
+        with:
+          file: ./coverage.out
+          flags: unittests
+          name: codecov-umbrella
+          fail_ci_if_error: false
+
       - name: Build
         run: go build ./...

README.md

@@ -1,6 +1,8 @@
 
 # AIBoMGen CLI (WIP)
 
+[![codecov](https://codecov.io/gh/idlab-discover/AIBoMGen-cli/branch/main/graph/badge.svg)](https://codecov.io/gh/idlab-discover/AIBoMGen-cli)
+
 Work-in-progress Go CLI to auto-detect AI artifacts (Hugging Face model IDs in Python and common weight files) and emit CycloneDX AIBOM. Designed for consumer/embedded pipelines with near-zero config. Can be merged with already generated SBOMs (for example with Syft).
 
 ## Current