Combine build steps and add volume to package

.drone.yml

@@ -2,42 +2,18 @@ kind: pipeline
 name: default
 
 steps:
-  - name: build-i386
+  - name: build
     image: golang:latest
     group: build
     volumes:
       - name: build
         path: /build
     commands:
-     - mkdir -p /build/i386
+     - mkdir -p /build/i386 /build/amd64 /build/armv7 /build/arm64
      - GOOS=linux GOARCH=386 go build -o /build/i386/owapi
-  - name: build-amd64
-    image: golang:latest
-    group: build
-    volumes:
-      - name: build
-        path: /build
-    commands:
-     - mkdir -p /build/amd64
      - go build -o /build/amd64/owapi
-  - name: build-armv7
-    image: golang:latest
-    group: build
-    volumes:
-      - name: build
-        path: /build
-    commands:
-      - mkdir -p /build/armv7
-      - GOOS=linux GOARCH=arm GOARM=7 go build -o /build/armv7/owapi
-  - name: build-arm64
-    image: golang:latest
-    group: build
-    volumes:
-      - name: build
-        path: /build
-    commands:
-      - mkdir -p /build/arm64
-      - GOOS=linux GOARCH=arm64 go build -o /build/arm64/owapi
+     - GOOS=linux GOARCH=arm GOARM=7 go build -o /build/armv7/owapi
+     - GOOS=linux GOARCH=arm64 go build -o /build/arm64/owapi
   - name: package
     image: tystuyfzand/fpm
     commands:
@@ -48,6 +24,9 @@ steps:
      - ARCH=armv7 packaging/build-package.sh
      - ARCH=arm64 packaging/build-package.sh
      - packaging/package-upload.sh
+    volumes:
+      - name: build
+        path: /build
     environment:
       UPLOAD_URL:
         from_secret: upload_url