Add configuration sync GitHub workflow

This adds a workflow that allows us to trigger the configuration sync
task via GitHub Actions rather than needing to do it manually using
kubectl.

.github/workflows/configuration-sync.yaml

@@ -0,0 +1,84 @@
+name: Synchronise configuration
+
+on: workflow_dispatch
+
+jobs:
+  export:
+    name: Export from production
+    runs-on: ubuntu-latest
+
+    environment: production
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: Azure/login@v2
+        with:
+          creds: ${{ secrets.AZURE_CREDENTIALS }}
+
+      - uses: ./.github/actions/set-kubernetes-credentials
+        with:
+          environment: production
+          azure-credentials: ${{ secrets.AZURE_CREDENTIALS }}
+
+      - name: Export configuration data
+        run: |
+          kubectl exec \
+            -n tra-production \
+            deployment/apply-for-qts-production-web \
+            -- sh -c "cd /app && /usr/local/bin/bundle exec rails configuration_sync:export[data.json]"
+
+      - name: Copy configuration data
+        run: |
+          kubectl cp \
+            -n tra-production \
+            deployment/apply-for-qts-production-web:data.json \
+            data.json
+
+      - name: Upload configuration data
+        uses: actions/upload-artifact@v4
+        with:
+          name: data
+          path: data.json
+          retention-days: 3
+
+  import:
+    name: Export from production
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        environment: [development, test]
+
+    environment: ${{ matrix.environment }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: Azure/login@v2
+        with:
+          creds: ${{ secrets.AZURE_CREDENTIALS }}
+
+      - uses: ./.github/actions/set-kubernetes-credentials
+        with:
+          environment: ${{ matrix.environment }}
+          azure-credentials: ${{ secrets.AZURE_CREDENTIALS }}
+
+      - name: Download configuration data
+        uses: actions/download-artifact@v4
+        with:
+          name: data
+
+      - name: Copy configuration data
+        run: |
+          kubectl cp \
+            -n tra-${{ matrix.environment }} \
+            data.json \
+            deployment/apply-for-qts-${{ matrix.environment }}-web:data.json
+
+      - name: Import configuration data
+        run: |
+          kubectl exec \
+            -n tra-${{ matrix.environment }} \
+            deployment/apply-for-qts-${{ matrix.environment }}-web \
+            -- sh -c "cd /app && /usr/local/bin/bundle exec rails configuration_sync:import[data.json]"