Created GitHub Actions Test Setup

- Added a GitHub Actions workflow that runs whenever there is a push to the repo.
- Workflow includes two jobs:
    - A matrix job of node versions (10, 12, 14, 16, 18) and operating systems (Linux (ubuntu), Mac and Windows (2019 Enterprise)) that runs all tests against mock and then runs s3 tests against a bucket (located at us-east-1-bucket) specified as a repo secret.
    - A matrix job of and NW.js versions (0.64.0, 0.50.2) and node versions (10, 12, ,14, 16) that runs the NW.js test script.

.github/workflows/push.yml

@@ -0,0 +1,74 @@
+name: Push - Matrix Tests
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  test-on-os-node-matrix:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-2019] # due to node-gyp & node compatibility issues, windows 2022 won't work for all node versions
+        node: [10, 12, 14, 16, 18]
+    env:
+      AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
+      AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+      S3_BUCKET: ${{ secrets.S3_BUCKET }}
+
+    name: Test Node ${{ matrix.node }} on ${{ matrix.os }}
+
+    steps:
+      - name: Checkout ${{ github.ref }}
+        uses: actions/checkout@v2
+
+      - name: Setup node ${{ matrix.node }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node }}
+
+      - name: NPM Install
+        run: npm install
+
+      - name: Configure Windows 2019
+        run: |
+          echo "/c/Program Files/Microsoft Visual Studio/2019/Enterprise/MSBuild/Current/Bin/" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+          npm config set msvs_version 2019
+        if: ${{ matrix.os == 'windows-2019' }}
+
+      - name: Show Environment Info
+        run: |
+          printenv
+          node --version
+          npm --version
+
+      - name: Run All Tests (against mock)
+        run: npm test
+        env:
+          node_pre_gyp_mock_s3 : true
+
+      - name: Run S3 Tests (against ${{ env.S3_BUCKET }} bucket)
+        run: |
+          npm run bucket ${{ env.S3_BUCKET }}
+          npm run test:s3
+        if: ${{ env.S3_BUCKET != '' }}
+
+  test-nw:
+    runs-on: ubuntu-18.04 # at current config the nw test requires python 2 as default. hence use older linux version
+    strategy:
+      matrix:
+        node: [10, 12, 14, 16] # node 18 requires glibc GLIBC_2.28 not available on older version of linux
+        nw: [0.64.0, 0.50.2] # current version as of may 2022 and the one tested before introduction of this action.
+    name: NW.js ${{ matrix.nw }} on Node ${{ matrix.node }}
+
+    steps:
+      - name: Checkout ${{ github.ref }}
+        uses: actions/checkout@v2
+
+      - name: Setup node ${{ matrix.node }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node }}
+
+      - name: Run Script
+        run: ./scripts/test-node-webkit.sh ${{ matrix.nw }}