Add continuous deployment to QA and Test

Pushes to the next branch now automatically deploy to both QA and Test
environments after CI passes.

Author: mikejamesthompson

.github/workflows/ci.yml

@@ -1,6 +1,8 @@
 name: CI
 
-on: [push]
+on:
+  push:
+  workflow_call:
 
 env:
   MISE_ENV: development

.github/workflows/continuous-deployment.yml

@@ -0,0 +1,24 @@
+name: Continuous deployment
+run-name: Continuous deployment of ${{ github.ref_name }} to QA and Test
+
+on:
+  push:
+    branches: [next]
+
+jobs:
+  ci:
+    permissions: {}
+    uses: ./.github/workflows/ci.yml
+    secrets: inherit
+  deploy:
+    needs: ci
+    strategy:
+      fail-fast: false
+      matrix:
+        environment: [qa, test]
+    permissions:
+      id-token: write
+    uses: ./.github/workflows/deploy-application.yml
+    with:
+      environment: ${{ matrix.environment }}
+      git_sha_to_deploy: ${{ github.sha }}