try to add a hash to the artifact

.github/workflows/all-ci.yml

@@ -34,3 +34,12 @@ jobs:
         with:
           name: prog8-compiler-jar-zipped
           path: compiler/build/libs/*-all.jar
+
+      - uses: MCJack123/ghaction-generate-release-hashes@v4
+        with:
+            hash-type: sha256
+            file-name: hashes.txt
+      - uses: actions/upload-artifact@v3
+        with:
+            name: Artifact Hashes
+            path: hashes.txt