Add stop-staging-slots workflow (#1904)

.github/workflows/stop-staging-slots.yml

@@ -0,0 +1,51 @@
+---
+name: Stop Staging Slots
+
+on:
+  workflow_dispatch:
+    inputs: {}
+
+
+jobs:
+  stop-slots:
+    name: Stop Slots
+    runs-on: ubuntu-20.04
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: Api
+          - name: Admin
+          - name: Billing
+          - name: Events
+          - name: Sso
+          - name: Identity
+    steps:
+      - name: Setup
+        id: setup
+        run: |
+          NAME_LOWER=$(echo "${{ matrix.name }}" | awk '{print tolower($0)}')
+          echo "Matrix name: ${{ matrix.name }}"
+          echo "NAME_LOWER: $NAME_LOWER"
+          echo "::set-output name=name_lower::$NAME_LOWER"
+
+      - name: Login to Azure
+        uses: Azure/login@1f63701bf3e6892515f1b7ce2d2bf1708b46beaf
+        with:
+          creds: ${{ secrets.AZURE_PROD_KV_CREDENTIALS }}
+
+      - name: Retrieve secrets
+        id: retrieve-secrets
+        env:
+          VAULT_NAME: "bitwarden-prod-kv"
+        run: |
+          webapp_name=$(
+            az keyvault secret show --vault-name $VAULT_NAME \
+              --name appservices-${{ steps.setup.outputs.name_lower }}-webapp-name \
+              --query value --output tsv
+          )
+          echo "::add-mask::$webapp_name"
+          echo "::set-output name=webapp-name::$webapp_name"
+
+      - name: Stop staging slot
+        run: az webapp stop -n ${{ steps.retrieve-secrets.outputs.webapp-name }} -g bitwarden -s staging