add testing workflow

.github/test_hash_chain.yml

@@ -0,0 +1,34 @@
+name: Rust Nightly Tests
+
+on:
+  push:
+    branches:
+      - main
+      - master
+  pull_request:
+    branches:
+      - main
+      - master
+
+jobs:
+  build_and_test:
+    name: Run Tests in Release Mode
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v3
+
+    - name: Set up Rust toolchain
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: nightly
+        profile: minimal
+        override: true
+        components: rustfmt, clippy
+
+    - name: Run cargo test in release mode
+      uses: actions-rs/cargo@v1
+      with:
+        command: test
+        args: --release