CI: build previous artifacts

.github/workflows/e2e_custom_cl.yml

@@ -85,6 +85,39 @@ jobs:
           image: backpackapp/build
           image-version: ${{ needs.get_projectserum_version.outputs.projectserum_version }}
 
+  e2e_custom_build_previous_artifacts:
+    name: E2E Build Previous Release Artifacts
+    environment: integration
+    permissions:
+      id-token: write
+      contents: read
+    runs-on: ubuntu-latest-32cores-128GB
+    needs: [e2e_custom_build_artifacts]
+    steps:
+      - name: Checkout previous release
+        uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
+        with:
+          ref: v1.0.2
+      - uses: actions/download-artifact@v4
+        with:
+          name: artifacts
+          path: ./temp/artifacts
+      - name: build & copy contracts
+        run: |
+          current="$(sha1sum ./temp/artifacts/* | sha1sum)" # get hash of current artifacts
+          
+          make build_contracts
+          mkdir -p temp/artifacts/previous
+          cp ${{ env.CONTRACT_ARTIFACTS_PATH }}/* temp/artifacts/previous
+
+          echo "previous: $(sha1sum ${{ env.CONTRACT_ARTIFACTS_PATH }}/* | sha1sum)" # get hash of previous artifacts
+          echo "current:  $current"
+      - uses: actions/upload-artifact@v4
+        with:
+          name: artifacts
+          path: ./temp/artifacts/ # combine artifacts
+          overwrite: true
+
   e2e_custom_build_custom_chainlink_image:
     name: E2E Custom Build Custom CL Image
     runs-on: ubuntu-latest-16cores-64GB