Fix nightly by calling the build workflow

This is the minimal fix needed. To transform the nightly CI to fully
leverage the reusable workflows, there is a need for more thinking.

[noissue]

templates/github/.github/workflows/nightly.yml.j2

@@ -26,8 +26,12 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  build:
+    uses: ./.github/workflows/build.yml
+
   test:
     runs-on: ubuntu-latest
+    needs: build
 
     strategy:
       fail-fast: false
@@ -56,6 +60,11 @@ jobs:
     steps:
       {{ checkout() | indent(6) }}
 
+      - uses: actions/download-artifact@v3
+        with:
+          name: plugin_package
+          path: dist/
+
       {{ setup_python() | indent(6) }}
 
       {{ install_httpie() | indent(6) }}
@@ -143,6 +152,11 @@ jobs:
     steps:
       {{ checkout() | indent(6) }}
 
+      - uses: actions/download-artifact@v3
+        with:
+          name: plugin_package
+          path: dist/
+
       {{ setup_python() | indent(6) }}
 
       {{ setup_ruby() | indent(6) }}