chore: upload binaries in CI workflow

.github/workflows/capsule.yaml

@@ -1,4 +1,7 @@
+# Test with native capsule cases
+
 name: Capsule build/test
+
 on:
   pull_request:
     paths:
@@ -8,7 +11,7 @@ on:
 
 jobs:
   capsule:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
       - uses: actions-rs/toolchain@v1

.github/workflows/release.yaml

@@ -0,0 +1,52 @@
+# Release contract binaries for mainnet and testnet
+
+name: Release binaries
+
+on:
+  pull_request:
+    paths:
+      - contracts/**
+      - lib/**
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions-rs/toolchain@v1
+        with:
+            toolchain: stable
+            override: true
+
+      - name: Prepare capsule v0.10.2
+        run: |
+          if [ ! -f "/tmp/capsule.tar.gz" ]; then
+            curl -L https://github.com/nervosnetwork/capsule/releases/download/v0.10.2/capsule_v0.10.2_x86_64-linux.tar.gz -o /tmp/capsule.tar.gz
+          fi
+          tar -zxf /tmp/capsule.tar.gz -C /tmp
+          echo "/tmp/capsule_v0.10.2_x86_64-linux" >> $GITHUB_PATH
+
+      - name: Install cross
+        run: cargo install cross --git https://github.com/cross-rs/cross
+
+      - name: Testnet build
+        run: capsule build --release
+
+      - name: Upload testnet binaries
+        uses: actions/upload-artifact@v3
+        with:
+            name: testnet-contracts
+            path: build/release
+
+      - name: Capsule clean
+        run: capsule clean
+
+      - name: Mainnet build
+        run: capsule build --release -- --features release_export
+
+      - name: Upload mainnet binaries
+        uses: actions/upload-artifact@v3
+        with:
+            name: mainnet-contracts
+            path: build/release
+