Added git workflow and shell script for fuzzing

.github/workflows/cargo_fuzz.yml

@@ -0,0 +1,32 @@
+---
+name: Cargo fuzz build
+on:
+  push:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  build_fuzzing:
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, macos-10.15]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: "true"
+      - uses: actions-rs/toolchain@v1
+        with:
+          target: thumbv7em-none-eabi
+      - uses: actions/setup-python@v1
+        with:
+          python-version: 3.7
+      - name: Install Python dependencies
+        run: python -m pip install --upgrade pip setuptools wheel
+      - name: Set up OpenSK
+        run: ./setup.sh
+      - name: Set up fuzzing
+        run: ./fuzzing_setup.sh
+
+      - name: Cargo fuzz build
+        run: cargo fuzz build

fuzzing_setup.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Ensure the script doesn't fail on Github workflows
+export TERM=${TERM:-vt100}
+done_text="$(tput bold)DONE.$(tput sgr0)"
+
+set -e
+
+# Install cargo-fuzz library.
+cargo install cargo-fuzz