**Description**
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This PR modifies the `.goreleaser.yaml` file such that a PKGBUILD file
for AUR deployment of clustertool is automatically generated and
published. I followed the [AUR GoReleaser
Documentation](https://goreleaser.com/customization/aur/).
The `version_template` key is unsupported in modern versions of
goreleaser, so I also replaced that key by `name_template`.
**⚙️ Type of change**
- [x] ⚙️ Feature/App addition
- [ ] 🪛 Bugfix
- [ ] ⚠️ Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] 🔃 Refactor of current code
- [ ] 📜 Documentation Changes
**🧪 How Has This Been Tested?**
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- I ran `goreleaser release --snapshot --clean`: no errors / warnings
- I ran `namcap -i PKGBUILD` on the newly generated file: no errors.
**📃 Notes:**
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Unfortunately, the [`metadata`
section](https://goreleaser.com/customization/metadata/) of the
`.goreleaser.yaml` file can only be used when using the pro version, so
I had to duplicate some variables (maintainer, homepage, description,
license) between the `aurs` and the `nfpms` sections.
The previous description was a bit too generic for the AUR, so I changed
it to make the package more easily understood.
**✔️ Checklist:**
- [x] ⚖️ My code follows the style guidelines of this project
- [x] 👀 I have performed a self-review of my own code
- [ ] #️⃣ I have commented my code, particularly in hard-to-understand
areas
- [ ] 📄 I have made changes to the documentation
- [ ] 🧪 I have added tests to this description that prove my fix is
effective or that my feature works
- [ ] ⬆️ I increased versions for any altered app according to semantic
versioning
- [ ] I made sure the title starts with `feat(chart-name):`,
`fix(chart-name):`, `chore(chart-name):`, `docs(chart-name):` or
`fix(docs):`
**➕ App addition**
If this PR is an app addition please make sure you have done the
following.
- [ ] 🖼️ I have added an icon in the Chart's root directory called
`icon.png`
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