Build Polkadot Nodes in CI - fixes artifact generation (#1410)

* new workflow and adjust node builder

* fix examples by fixing artifacts script

* use-nodes instead of use-substrate

* update yamls

* build polkadot

* remove the on-push trigger again, now that polkadot built in the CI

* add default implementation again

.github/workflows/build-nodes.yml

@@ -0,0 +1,61 @@
+name: Build Substrate and Polkadot Binaries
+
+on:
+  # Allow it to be manually ran to rebuild binary when needed:
+  workflow_dispatch: {}
+  # Run at 2am every day for nightly builds.
+  schedule:
+    - cron: "0 2 * * *"
+
+jobs:
+  tests:
+    name: Build Substrate and Polkadot Binaries
+    runs-on: ubuntu-latest-16-cores
+    steps:
+      - name: checkout polkadot-sdk
+        uses: actions/checkout@v4
+        with:
+          repository: paritytech/polkadot-sdk
+
+      - name: Install dependencies
+        run: sudo apt-get install -y protobuf-compiler
+
+      - name: Install WASM toolchain
+        run: rustup target add wasm32-unknown-unknown
+
+      - name: Install WASM toolchain
+        run: rustup component add rust-src
+
+      - name: Rust Cache
+        uses: Swatinem/rust-cache@23bce251a8cd2ffc3c1075eaa2367cf899916d84 # v2.7.3
+
+      - name: build substrate binary
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --release --manifest-path substrate/bin/node/cli/Cargo.toml
+
+      - name: upload substrate binary
+        uses: actions/upload-artifact@v3
+        with:
+          name: nightly-substrate-binary
+          path: target/release/substrate-node
+          retention-days: 2
+          if-no-files-found: error
+
+      - name: build polkadot binary
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --release --manifest-path polkadot/Cargo.toml
+
+      - name: upload polkadot binary
+        uses: actions/upload-artifact@v3
+        with:
+          name: nightly-polkadot-binary
+          path: |
+            target/release/polkadot
+            target/release/polkadot-execute-worker
+            target/release/polkadot-prepare-worker
+          retention-days: 2
+          if-no-files-found: error