docs: describe the release process (#82)

docs: describe the release process

Co-authored-by: Leo Di Donato <[email protected]>

docs/release.md

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+# kubectl-trace Release Process
+
+Our release process is automated using [goreleaser](https://github.com/goreleaser/goreleaser).
+
+When we release we do the following process:
+
+1. We decide together (usually in the #kubectl-trace channel in Kubernetes slack) what's the next version to tag
+2. A person with repository rights does the tag
+3. The same person runs goreleaser in their machine
+4. The tag is live on Github with the artifacts
+5. Travis builds the tag and push the related docker images
+
+## Release commands
+
+Tag the version
+
+```bash
+git tag -a v0.1.0-rc.0 -m "v0.1.0-rc.0"
+git push origin v0.1.0-rc.0
+```
+
+Run goreleaser, make sure to export your GitHub token first.
+
+```
+export GITHUB_TOKEN=<YOUR_GH_TOKEN>
+make cross
+```
+