Add explanation for "Get current version" step in release workflow

Signed-off-by: Heiko Kiesel <heiko.kiesel@iteratec.com>

Author: Heiko Kiesel

.github/workflows/release.yml

@@ -44,6 +44,8 @@ jobs:
           git config user.email 'github-actions[bot]@users.noreply.github.com'
           ./gradlew release
 
+      # The previous "Release new version" step increases the version. We need this version for the publishing job. The
+      # currentVersion command gets this value, which we store in the "version" variable for following jobs.
       - name: Get current version
         id: version
         run: echo "::set-output name=version::$(./gradlew -q -Prelease.quiet currentVersion)"