build: change drone config to fix docker daemon error

.drone.yml

@@ -3,12 +3,22 @@ name: portfolio
 
 steps:
   - name: build
-    image: docker
+    image: docker:latest
+    volumes:
+      - name: dockersock
+        path: /var/run/docker.sock
     commands:
-      - docker build -t portfolio .
+      - docker build -t portfolio-image .
-      - docker push portfolio-image
 
   - name: deploy
-    image: docker
+    image: docker:latest
+    volumes:
+      - name: dockersock
+        path: /var/run/docker.sock
     commands:
       - docker run -p 8180:8180 -d portfolio-image
+
+volumes:
+  - name: dockersock
+    host:
+      path: /var/run/docker.sock