[DEVOPS-242] add clear redis caches workflow (#46)

<details open>
<summary><a href="https://amuniversal.atlassian.net/browse/DEVOPS-242"
title="DEVOPS-242" target="_blank">DEVOPS-242</a></summary>
  <br />
  <table>
    <tr>
      <th>Summary</th>
<td>DevOps: Create GitHub Actions workflow for clearing Azure Redis
Caches</td>
    </tr>
    <tr>
      <th>Type</th>
      <td>
<img alt="Story"
src="https://amuniversal.atlassian.net/images/icons/issuetypes/story.png"
/>
        Story
      </td>
    </tr>
    <tr>
      <th>Status</th>
      <td>In Progress</td>
    </tr>
    <tr>
      <th>Points</th>
      <td>N/A</td>
    </tr>
    <tr>
      <th>Labels</th>
<td><a
href="https://amuniversal.atlassian.net/issues?jql=project%20%3D%20DEVOPS%20AND%20labels%20%3D%20ServiceDesk%20ORDER%20BY%20created%20DESC"
title="ServiceDesk">ServiceDesk</a></td>
    </tr>
  </table>
</details>
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## Description

- Added workflow to clear Redis caches based off environment

## Related Issues

<!-- List any related Jira issues here -->

- Jira Issue: DEVOPS-242
- Testing Environment: [![Clear Azure Redis
Cache](https://github.com/Andrews-McMeel-Universal/reusable_workflows-test/actions/workflows/clear-azure-redis-cache.yml/badge.svg)](https://github.com/Andrews-McMeel-Universal/reusable_workflows-test/actions/workflows/clear-azure-redis-cache.yml)

.github/workflows/clear-azure-redis-cache.yaml

@@ -0,0 +1,70 @@
+name: Clear Azure Redis Cache
+
+on:
+  workflow_call:
+    inputs:
+      environment:
+        required: true
+        type: string
+        description: "Environment to clear caches for."
+      resourceGroupName:
+        default: "AMU_DevOps_RG"
+        type: string
+        description: "Name of Resource Group that the Azure Redis Instance is in."
+    secrets:
+      azureCredentials:
+       required: true
+
+jobs:
+  clear-redis-cache:
+    name: Clear Azure Redis Cache
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Login to Azure
+        uses: Andrews-McMeel-Universal/cache-azure-login@v1
+        with:
+          azureCredentials: "${{ secrets.azureCredentials }}"
+
+      - name: Install Dependencies
+        uses: awalsh128/cache-apt-pkgs-action@v1
+        with:
+          packages: redis-tools
+          version: 1.0
+
+      # Script is adapted from https://github.com/Andrews-McMeel-Universal/azure-content-management_tool/blob/main/Scripts/rundeck/Flush-RedisCache.ps1
+      - name: Clear Redis Cache
+        uses: azure/powershell@v1
+        with:
+          inlineScript: |
+            # Check to see if Azure Redis Cache PowerShell Module is installed
+            Install-Module -Name Az.RedisCache -Confirm:$false -Force
+
+            # Get list of Redis instances using tags
+            $Redis = Get-AzRedisCache -ResourceGroupName "${{ inputs.resourceGroupName }}" | Where-Object { $_.Tag.Values -eq "${{ inputs.environment }}" }
+
+            # Loop through Redis instances
+            $Redis | ForEach-Object {
+                $RedisHostname = $_.HostName
+                $RedisPort = $_.Port
+                $RedisName = $_.Name
+                $RedisKey = (Get-AzRedisCacheKey -Name $RedisName -ResourceGroupName "${{ inputs.resourceGroupName }}").PrimaryKey
+
+                # Authenticate using Redis key and flush cache database
+                $RedisCommands = "AUTH $RedisKey
+                SELECT 0
+                FLUSHDB"
+                $RedisResult = $RedisCommands | redis-cli -h "$RedisHostname" -p "$RedisPort"
+
+                # Check if output from cache clearing command has correct status message
+                if ($RedisResult -match 'OK') {
+                    Write-Host "Successfully flushed cache for $RedisHostname" -ForegroundColor Green
+                }
+                else {
+                    Write-Error "Failed to clear cache for $RedisHostname"
+                }
+            }
+          azPSVersion: "latest"
+