feat: Add separate build job + download artifact

.github/workflows/integrate.yaml

@@ -51,12 +51,28 @@ jobs:
       - name: Run unit tests
         run: tox -e unit
 
-  deploy:
+  build:
+    name: Build charm
+    uses: canonical/data-platform-workflows/.github/workflows/build_charm.yaml@v21.0.0
+    with:
+      cache: true
+
+  integration-tests:
     name: Integration Test
     runs-on: ubuntu-20.04
+    needs: [build]
     steps:
       - name: Check out code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
+
+      - name: Download packed charm(s)
+        id: download-charms
+        timeout-minutes: 5
+        uses: actions/download-artifact@v4
+        with:
+          pattern: ${{ needs.build.outputs.artifact-prefix }}-*
+          merge-multiple: true
+
       - name: Setup operator environment
         uses: charmed-kubernetes/actions-operator@main
         with:

.gitignore

@@ -0,0 +1,4 @@
+*.charm
+*__pycache__
+*.tox
+venv/