Another try.

.drone.yml

@@ -2,37 +2,43 @@ kind: pipeline
 type: kubernetes
 name: back-end
 
+workspace:
+  path: /drone/src
+
 steps:
 - name: install dependencies
   image: sandervocke/postgres_node:12
   commands:
   - npm install
-  - cd server && npm install; cd ..
+  - cd /drone/src/server && npm install
 
 - name: back-end test (SQLite3)
   image: node
   commands:
-  - cd server && ./test/test.sh --sqlite ; cd ..
+  - cd /drone/src/server && ./test/test.sh --sqlite
 
 - name: back-end test (PostgreSQL)
   image: node
   commands:
   - POSTGRES_USER=mudbase POSTGRES_DATABASE=mudbase POSTGRES_DB=mudbase \
-    cd server && ./test/test.sh --postgres --start-postgres-testcontainer ; cd ..
+    cd /drone/src/server && ./test/test.sh --postgres --start-postgres-testcontainer
 
 ---
 kind: pipeline
 type: kubernetes
 name: front-end
 
+workspace:
+  path: /drone/src
+
 steps:
 - name: install dependencies
   image: node
   commands:
-  - npm install
-  - cd client && npm install; cd ..
+  - cd /drone/src && npm install
+  - cd /drone/src/client && npm install
 
 - name: front-end compile
   image: node
   commands:
-  - cd client && ./node_modules/.bin/tsc; cd ..
+  - cd /drone/src/client && ./node_modules/.bin/tsc; cd ..