Closes #463 Switch to codecov

Author: bukajsytlos

.github/codecov.yml

@@ -0,0 +1,2 @@
+comment:
+  layout: "diff,flags,files,footer"

.github/workflows/build.yaml

@@ -54,7 +54,7 @@ jobs:
           GRADLE_CLI_OPTS: "--console=plain --stacktrace --quiet"
           DATABASE_ADDRESS: faf-db
           LEAGUE_DATABASE_ADDRESS: faf-league-db
-        run: "chmod +x ./gradlew && ./gradlew ${GRADLE_CLI_OPTS} build jacocoTestReport coveralls"
+        run: "chmod +x ./gradlew && ./gradlew ${GRADLE_CLI_OPTS} build jacocoTestReport"
       - name: Build and push Docker images
         if: github.ref == 'refs/heads/develop' || startsWith(github.ref, 'refs/tags')
         uses: docker/build-push-action@v1.1.1
@@ -63,7 +63,8 @@ jobs:
           password: ${{ secrets.DOCKER_PASSWORD }}
           repository: faforever/faf-java-api
           tag_with_ref: true
-      - name: Coveralls
-        uses: coverallsapp/github-action@master
+      - name: Codecov
+        uses: codecov/codecov-action@v1
         with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
+          file: ./build/reports/jacoco/test/jacocoTestReport.xml
+          name: codecov