Added release instructions

Signed-off-by: Tero Saarni <[email protected]>

docs/release-instructions.md

@@ -0,0 +1,71 @@
+# Release instructions
+
+This document describes the steps to create a new release of the project.
+
+### Tag the release in git
+
+Check that you have the `main` branch up to date with the remote repository:
+
+```bash
+git checkout main
+git pull
+```
+
+Make sure that the working directory is clean:
+
+```console
+git status
+```
+
+Update the release version in `pom.xml`, for example:
+
+```console
+mvn versions:set -DnewVersion=1.0.0
+```
+
+Run the tests once to make sure that everything is working:
+
+```console
+./mvnw clean verify
+```
+
+Commit the version change:
+
+```console
+git add pom.xml && git commit -sm "Release v1.0.0"
+```
+
+
+Create a new tag:
+
+```console
+git tag v1.0.0
+```
+
+Update the release version in `pom.xml` to the next snapshot version, for example:
+
+```console
+mvn versions:set -DnewVersion=1.1.0-SNAPSHOT
+```
+
+Commit the version change:
+
+```console
+git add pom.xml && git commit -sm "Updated for next snapshot version"
+```
+
+Push the changes to the remote repository:
+
+```console
+git push && git push --tags
+```
+
+## Create release notes on GitHub
+
+Go to https://github.com/Nordix/keycloak-client-cert-lookup-for-envoy/releases and click "Draft a new release".
+
+1. Click "Choose a tag" and choose the tag that was pushed, for example `v1.0.0`.
+2. Add a title, for example "v1.0.0".
+3. Click "Generate release notes" to get the commit/change link.
+4. Update the release notes.
+5. Click "Publish release"