ci: opt into integration/e2e tiers + README template badges

Follow-up to the go-check.yml integration/e2e expansion in
netresearch/.github. This repo has integration/e2e test files so
enable the corresponding go-check inputs, and add the drift-check +
template-source badges to the README so template governance is
visible on the repo landing page.

Signed-off-by: Sebastian Mendel <sebastian.mendel@netresearch.de>

Author: CybotTM

.github/workflows/ci.yml

@@ -22,6 +22,7 @@ jobs:
       enable-fuzz: true
       enable-license-check: true
       enable-codecov: true
+      enable-integration-tests: true
       coverage-threshold: 80.0
     permissions:
       contents: read

README.md

@@ -1,5 +1,8 @@
 # Ofelia - a job scheduler
 
+[![Template Drift](https://github.com/netresearch/ofelia/actions/workflows/check-template-drift.yml/badge.svg)](https://github.com/netresearch/ofelia/actions/workflows/check-template-drift.yml)
+[![managed by netresearch/.github templates](https://img.shields.io/badge/template-netresearch%2F.github-2F99A4?logo=github)](https://github.com/netresearch/.github/tree/main/templates/go-app)
+
 [![Go Reference](https://pkg.go.dev/badge/github.com/netresearch/ofelia.svg)](https://pkg.go.dev/github.com/netresearch/ofelia)
 [![CI](https://github.com/netresearch/ofelia/actions/workflows/ci.yml/badge.svg)](https://github.com/netresearch/ofelia/actions/workflows/ci.yml)
 [![CodSpeed](https://img.shields.io/endpoint?url=https://codspeed.io/badge.json&style=flat&label=benchmarks&logo=codspeed)](https://codspeed.io/netresearch/ofelia)