CI workflows

.github/workflows/cpp.yml

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+name: Ubuntu C++ Tests
+on: [push]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+      with:
+        submodules: 'recursive'
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v2
+      with:
+        node-version: '16'
+
+    - name: Install Yarn dependencies and build
+      run: |
+        yarn
+        yarn build
+
+    - name: Start Hardhat node in background
+      run: |
+        yarn hardhat-node &
+        echo "NODE_PID=$!" >> $GITHUB_ENV
+
+    - name: Install prerequisites for C++ build
+      run: sudo apt-get update && sudo apt-get install -y cmake build-essential libboost-all-dev libssl-dev libcurl4-openssl-dev libsodium-dev
+
+    - name: Create and change into Build Directory
+      run: mkdir -p test/cpp/build
+
+    - name: CMake Generate
+      working-directory: ./test/cpp/build
+      run: cmake -B. -H.. --debug-output
+
+    - name: Compile
+      working-directory: ./test/cpp/build
+      run: cmake --build .
+
+    - name: Run C++ tests
+      working-directory: ./test/cpp/build
+      run: ctest -VV --repeat until-pass:2 --test-dir .
+
+    - name: Kill Yarn node
+      run: kill $NODE_PID
+      if: always()
+

.github/workflows/hardhat.yml

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+name: Ubuntu Hardhat Tests
+on: [push]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 16
+      - uses: actions/cache@v2
+        with:
+          path: "**/node_modules"
+          key: ${{ runner.os }}-modules-${{ hashFiles('**/yarn.lock') }}
+      - run: yarn
+      - run: yarn build
+      - run: yarn test