:gear: added back backend testing to drone file

.drone.yml

+---
 #################
 # Frontend Test #
 #################
     - name: frontend_node_cache
       host:
           path: /tmp/cache/drone/frontend/node_modules
+---
+##################
+# Frontend Build #
+##################
+
+kind: pipeline
+type: docker
+name: frontend_run_build
+depends_on:
+    - frontend_run_tests
+trigger:
+    status:
+        - success
+    branch:
+        - dev
+
+steps:
+    - name: build-frontend
+      image: node
+      volumes:
+          - name: frontend_node_cache
+            path: /drone/src/frontend/node_modules
+          - name: frontend_build
+            path: /drone/src/frontend/build
+      commands:
+          - cd ./frontend
+          - rm -Rf ./build/*
+          - npx browserslist@latest --update-db
+          - npm run build
+          - ls ./build
+      environment:
+          NODE_OPTIONS: --openssl-legacy-provider
+
+volumes:
+    - name: frontend_node_cache
+      host:
+          path: /tmp/cache/drone/frontend/node_modules
+    - name: frontend_build
+      host:
+          path: /tmp/cache/drone/frontend/build
+---
+#################
+# Backend Tests #
+#################
+
+kind: pipeline
+type: docker
+name: backend_run_tests
+
+steps:
+    - name: test-backend
+      image: node
+      volumes:
+          - name: backend_node_cache
+            path: /drone/src/backend/node_modules
+      commands:
+          - pwd
+          - cd ./backend
+          - npm install
+          - npm test
+
+volumes:
+    - name: backend_node_cache
+      host:
+          path: /tmp/cache/drone/backend/node_modules