CI: split tasks

.github/workflows/crystal.yml

@@ -26,6 +26,7 @@ jobs:
 
   build:
     runs-on: ubuntu-latest
+    needs: test
 
     container:
       image: crystallang/crystal
@@ -41,7 +42,16 @@ jobs:
       run: shards install
     - name: Run tests
       run: crystal build
-      
+
+  deliver:
+    runs-on: ubuntu-latest
+    needs: build
+
+    container:
+      image: crystallang/crystal
+
+    steps:
+    - uses: actions/checkout@v2
     - name: Create Release
       id: create_release
       uses: actions/create-release@v1