Add CI pipeline with Github Actions to validate the script

.github/workflows/linting.yml

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+name: Linting
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  lint:
+    name: Run PS Script Analyzer
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: lint
+      uses: devblackops/github-action-psscriptanalyzer@master
+      with:
+        failOnErrors: true
+        failOnWarnings: false
+        failOnInfos: false

.github/workflows/tests.yml

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+name: Unit tests
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  test-pwsh:
+    defaults:
+      run:
+        shell: pwsh
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3.1.0
+
+      - name: Run Pester Tests (pwsh)
+        run: |
+          Write-Output $PSVersionTable.PSVersion.Major $PSVersionTable.PSRemotingProtocolVersion.Minor
+          Set-PSRepository psgallery -InstallationPolicy trusted
+          Install-Module -Name Pester -Confirm:$false -Force
+          Invoke-Pester -Path "./tests" -EnableExit -Show All
+
+  test-powershell:
+    runs-on: windows-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3.1.0
+
+      - name: Run Pester Tests (powershell)
+        shell: powershell
+        run: |
+          Write-Output $PSVersionTable.PSVersion.Major $PSVersionTable.PSRemotingProtocolVersion.Minor
+          Set-PSRepository psgallery -InstallationPolicy trusted
+          Install-Module -Name Pester -Confirm:$false -Force
+          Invoke-Pester -Path "./tests" -Show All