ci: add codecov coverage reporting

Author: matzehuels

.github/workflows/ci.yml

@@ -30,7 +30,14 @@ jobs:
           version: v2.1.6
 
       - name: Test
-        run: go test -race -timeout=2m ./...
+        run: go test -race -coverprofile=coverage.txt -timeout=2m ./...
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: coverage.txt
+          fail_ci_if_error: false
 
       - name: Vulncheck
         run: |

README.md

@@ -1,6 +1,7 @@
 # Stacktower
 
 [![CI](https://github.com/matzehuels/stacktower/actions/workflows/ci.yml/badge.svg)](https://github.com/matzehuels/stacktower/actions/workflows/ci.yml)
+[![codecov](https://codecov.io/gh/matzehuels/stacktower/graph/badge.svg)](https://codecov.io/gh/matzehuels/stacktower)
 [![Go Report Card](https://goreportcard.com/badge/github.com/matzehuels/stacktower)](https://goreportcard.com/report/github.com/matzehuels/stacktower)
 [![Release](https://img.shields.io/github/v/release/matzehuels/stacktower)](https://github.com/matzehuels/stacktower/releases)
 [![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)