Add SonarCloud (#58)

.github/workflows/sonar.yml

@@ -0,0 +1,23 @@
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types: [opened, synchronize, reopened]
+name: SonarCloud
+jobs:
+  sonarcloud:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: SonarCloud Scan
+        uses: sonarsource/sonarcloud-github-action@master
+        with:
+          args: >
+            -Dsonar.organization=baking-bad
+            -Dsonar.projectKey=baking-bad_netezos
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}