**Description**
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* Fix Livebook container image source and upgrade to latest version
* Add environment variables, mostly for clustering of multiple replicas
**⚙️ Type of change**
- [ ] ⚙️ Feature/App addition
- [ ] 🪛 Bugfix
- [ ] ⚠️ Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [x] 🔃 Refactor of current code
**🧪 How Has This Been Tested?**
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I've used a local KIND cluster and `helm template` => `kubectl install`
**📃 Notes:**
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**✔️ Checklist:**
- [x] ⚖️ My code follows the style guidelines of this project
- [x] 👀 I have performed a self-review of my own code
- [x] #️⃣ I have commented my code, particularly in hard-to-understand
areas
- [ ] 📄 I have made corresponding changes to the documentation
- [x] ⚠️ My changes generate no new warnings
- [ ] 🧪 I have added tests to this description that prove my fix is
effective or that my feature works
- [x] ⬆️ I increased versions for any altered app according to semantic
versioning
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