chore: coverage badge

.github/workflows/check_coverage.yml

@@ -0,0 +1,28 @@
+name: Check test coverage
+
+on:
+  push:
+    branches: ["*"]
+
+jobs:
+  check-coverage:
+    name: Check Test Coverage
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Setup Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.21'
+      - name: check test coverage
+        uses: vladopajic/go-test-coverage@v2
+        with:
+          profile: cover.out
+          local-prefix: github.com/lucaschain/beholder
+          threshold-total: 80
+
+          git-token: ${{ github.ref_name == 'main' && secrets.GH_TOKEN || '' }}
+          git-branch: badges

README.md

@@ -1,4 +1,5 @@
 ![main branch status checks](https://github.com/lucaschain/beholder/actions/workflows/build_and_test.yml/badge.svg)
+![coverage](https://raw.githubusercontent.com/org/project/badges/.badges/main/coverage.svg)
 
 # Beholder