docs(website): Add SourceHut builds example (#617)

* docs: Add SourceHut builds example

Signed-off-by: Tim Hårek Andreassen <tim@harek.no>

* docs: polish SourceHut docs

---------

Signed-off-by: Tim Hårek Andreassen <tim@harek.no>
Co-authored-by: Orhun Parmaksız <orhunparmaksiz@gmail.com>

website/docs/sourcehut.md

@@ -0,0 +1,43 @@
+---
+sidebar_position: 11
+---
+
+# Sourcehut Builds
+
+It is possible to generate changelogs using [SourceHut builds](https://builds.sr.ht).
+
+```yaml
+image: alpine/edge
+packages:
+  - git-cliff
+secrets:
+  - <your-builds.sr.ht-secret>
+sources:
+  - git://git@git.sr.ht:~<username>/<repo-name>
+environment:
+  dir: <repo-name>
+  source: <your-source>
+tasks:
+  - git-cliff: |
+      cd $dir
+      cd $dir
+      git cliff -o CHANGELOG.md
+      ssh-keyscan -t rsa git.sr.ht >> ~/.ssh/known_hosts
+      git remote set-url origin $source
+      git checkout main
+      git add CHANGELOG.md
+      git commit -m "chore(release): Update CHANGELOG"
+      git push -o skip-ci
+```
+
+1. Generate a new SSH-key for SourceHut builds:
+   `ssh-keygen -t ed25519 -C "builds.sr.ht" -f ~/.ssh/builds-srht`
+2. Add the newly generated public key to your
+   [SourceHut account](https://meta.sr.ht/keys).
+3. Add the private key as a secret to your
+   [Sourcehut Builds](https://builds.sr.ht/secrets).
+4. Replace all the placeholders in your `.build.yml`:
+   - `<your-builds.sr.ht-secret>`
+   - `<username>`
+   - `<repo-name>`
+   - `<your-source>`