chore: Update Go build workflow and Makefile, improve CI

.github/workflows/build.yml

@@ -1,16 +1,15 @@
 name: Go
 
 env:
-  GO_VERSION: '1.23'
-  GO_LINT_VERSION: 'v1.60.3'
+  GO_VERSION: "1.23"
+  GO_LINT_VERSION: "v1.60.3"
 
 on:
   push:
     branches:
-      - develop
       - main
-
   pull_request:
+    types: [opened, reopened, synchronize]
 
 permissions:
   # Required: allow read access to the content for analysis.
@@ -54,3 +53,16 @@ jobs:
           go-version: ${{env.GO_VERSION}}
       - name: Test
         run: make test
+      - name: Archive code coverage results
+        uses: actions/upload-artifact@v4
+        with:
+          name: code-coverage
+          path: coverage.txt
+
+  coverage:
+    name: "Code coverage report"
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    needs: test
+    steps:
+      - uses: fgrosse/go-coverage-report@v1.0.2