ci: add metadata worflow

.github/workflows/metadata-ci.yml

@@ -0,0 +1,36 @@
+name: Rust CI
+
+on:
+  pull_request:
+    paths:
+    - 'ark-metadata/**/*.rs'
+    - 'ark-metadata/Cargo.toml'
+    - 'ark-metadata/Cargo.lock'
+
+jobs:
+  build_and_test:
+    name: Build and Test
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Install Rust
+      uses: actions-rs/toolchain@v1
+      with:
+        profile: minimal
+        toolchain: stable
+        override: true
+
+    - name: Build ark-metadata crate
+      uses: actions-rs/cargo@v1
+      with:
+        command: build
+        args: --manifest-path ark-metadata/Cargo.toml --all-features
+
+    - name: Run tests for ark-metadata crate
+      uses: actions-rs/cargo@v1
+      with:
+        command: test
+        args: --manifest-path ark-metadata/Cargo.toml --all-features