Add job summary with release URL

Author: avdv

.github/workflows/prepare-release.yaml

@@ -47,4 +47,5 @@ jobs:
             --notes-file release_notes.txt \
             --title v${{ '0.20' }} \
             v${{ '0.20' }} \
-            ${GITHUB_REPOSITORY#*/}-${{ '0.20' }}.tar.gz
+            ${GITHUB_REPOSITORY#*/}-${{ '0.20' }}.tar.gz \
+            | sed -e 's/.*/:rocket: Draft release created [here](&)./' >> "$GITHUB_STEP_SUMMARY"