feat: add Rust CI test workflow for smart contracts (#25)

.github/workflows/rust-ci-tests.yml

@@ -0,0 +1,60 @@
+rname: Rust CI Tests
+
+on:
+  pull_request:
+    paths:
+      - "contracts/**"
+      - "Cargo.toml"
+      - "Cargo.lock"
+      - "rust-toolchain.toml"
+  push:
+    branches:
+      - main
+      - master
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  test:
+    name: Rust Compilation Check
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: wasm32-unknown-unknown
+          components: rustfmt, clippy
+
+      - name: Cache cargo registry
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-test-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-test-
+            ${{ runner.os }}-cargo-
+
+      - name: Check compilation (abundance-token)
+        run: cargo check --package abundance-token
+        working-directory: contracts
+
+      - name: Check compilation (crowdfund)
+        run: cargo check --package soroban-crowdfund-contract
+        working-directory: contracts
+
+      - name: Check compilation (mock-token)
+        run: cargo check --package mock-token
+        working-directory: contracts
+
+      - name: Check all workspace packages compile
+        run: cargo check --workspace
+        working-directory: contracts

Cargo.toml

@@ -17,3 +17,4 @@ lto = true
 [workspace.dependencies]
 soroban-sdk = "20.0.0-rc2"
 soroban-token-sdk = "20.0.0-rc2"
+