CI node artifact (#679)

In this PR in the CI added node compiled binary as an artifact to be
fetched from other repositories for the testing purpose. This changes
reduces e2e execution time on ~7 minutes (which is ~27%).

Related to PR
[748](Polkadex-Substrate/orderbook#748).

.github/workflows/ci.yml

@@ -3,7 +3,7 @@ name: Continuous Integration
 on:
   pull_request: []
   push:
-    branches: [Develop, main-net-runtime, redux-ci-testing]
+    branches: [Develop, mainnet-release]
 
 env:
   RUNNER_INSTANCE_TYPE: c5.4xlarge
@@ -50,7 +50,7 @@ jobs:
         run: |
           cat /etc/issue 
           apt update
-          apt install -y clang lldb lld gcc
+          apt install -y clang lldb lld gcc zip
       - name: Install latest nightly with wasm target
         uses: actions-rs/toolchain@v1
         with:
@@ -101,6 +101,17 @@ jobs:
         with:
           name: code-coverage-report
           path: cobertura.xml
+      - name: Zip compiled binaries
+        if: contains(github.ref, 'Develop')
+        # Zipping is required since billing is based on the raw uploaded size.
+        run: zip -r -j polkadex-node.zip ./target/release/polkadex-node
+      - name: Upload zipped binaries as an artifact
+        if: contains(github.ref, 'Develop')
+        uses: actions/upload-artifact@v3
+        with:
+          name: polkadex-node
+          path: ./polkadex-node.zip
+          if-no-files-found: error
   stop-runner:
     name: Stop self-hosted EC2 runner
     needs: