docs: Add information about release process (#96)

docs/internal/release-process.md

@@ -0,0 +1,19 @@
+# Release process
+
+## Main package
+
+1. Create a new tag with the format `v<MAJOR>.<MINOR>.<PATCH>` depending on the
+   changes since the last release.
+
+2. Create a new GitHub release by picking the new tag and also click the
+   "Generate release notes" button to fill the release information with
+   information about the changes since the previous release.
+
+## Helm charts
+
+1. Bump the chart version in `charts/k6-loadtester/Chart.yaml` depending on the
+   changes since the last release of the Helm charts and push that updated chart
+   file to the `main` branch.
+
+The tag and the actual release will then be handled by
+[helm/chart-releaser-action](https://github.com/helm/chart-releaser-action).