docs: add release process

docs/release_process.md

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+#  Torrust Index Release Process (v2.2.2)
+
+## Version:
+> **The `[semantic version]` is bumped according to releases, new features, and breaking changes.**
+>
+> *The `develop` branch uses the (semantic version) suffix `-develop`.*
+
+## Process:
+
+**Note**: this guide assumes that the your git `torrust` remote is like this:
+
+```sh
+git remote show torrust
+```
+
+```s
+* remote torrust
+  Fetch URL: [email protected]:torrust/torrust-index.git
+  Push  URL: [email protected]:torrust/torrust-index.git
+...
+```
+
+
+### 1. The `develop` branch is ready for a release.
+The `develop` branch should have the version `[semantic version]-develop` that is ready to be released.
+
+### 2. Stage `develop` HEAD for merging into the `main` branch:
+
+```sh
+git fetch --all
+git push --force torrust develop:staging/main
+```
+
+### 3. Create Release Commit:
+
+```sh
+git stash
+git switch staging/main
+git reset --hard torrust/staging/main
+# change `[semantic version]-develop` to `[semantic version]`.
+git add -A
+git commit -m "release: version [semantic version]"
+git push torrust
+```
+
+### 4. Create and Merge Pull Request from `staging/main` into `main` branch.
+
+Pull request title format: "Release Version `[semantic version]`".
+
+This pull request merges the new version into the `main` branch.
+
+### 5. Push new version from `main` HEAD to `releases/v[semantic version]` branch:
+
+```sh
+git fetch --all
+git push torrust main:releases/v[semantic version]
+```
+
+> **Check that the deployment is successful!**
+
+### 6. Create Release Tag:
+
+```sh
+git switch releases/v[semantic version]
+git tag --sign v[semantic version]
+git push --tags torrust
+```
+
+### 7. Create Release on Github from Tag.
+This is for those who wish to download the source code.
+
+### 8. Stage `main` HEAD for merging into the `develop` branch:
+Merge release back into the develop branch.
+
+```sh
+git fetch --all
+git push --force torrust main:staging/develop
+```
+### 9. Create Comment that bumps next development version:
+
+```sh
+git stash
+git switch staging/develop
+git reset --hard torrust/staging/develop
+# change `[semantic version]` to `(next)[semantic version]-develop`.
+git add -A
+git commit -m "develop: bump to version (next)[semantic version]-develop"
+git push torrust
+```
+
+### 10. Create and Merge Pull Request from `staging/develop` into `develop` branch.
+
+Pull request title format: "Version `[semantic version]` was Released".
+
+This pull request merges the new release into the `develop` branch and bumps the version number.