Revert "Remove serverless plugin config from serverless file"

This reverts commit f2fff7a.

.github/workflows/deployment.yml

@@ -95,7 +95,9 @@ jobs:
 
     # Install serverless
     - name: Install Serverless
-      run: npm install -g serverless
+      run: |
+        npm install -g serverless &&
+        npm install --save serverless-python-requirements
 
     # Install Node dependencies
     - name: Set up Environment

serverless.yml

@@ -11,6 +11,12 @@ package:
     - '!.pytest_cache/**'
     - '!.vscode/**'
 
+plugins:
+  - serverless-python-requirements
+  - serverless-domain-manager
+  - serverless-prune-plugin
+  - serverless-offline
+
 custom:
   # This is the 'variable' for the customDomain.basePath value, based on the stage.
   # Run as `sls deploy --stage <stage_name>`