added script to build for drone

.drone.yml

@@ -10,14 +10,11 @@ platform:
 steps:
   - name: build
     image: golang
+    commands:
+      - ./ci-build.sh
     environment:
       GOOS: linux
       GOARCH: amd64
-    commands:
-      - mkdir dist
-      - "go build -o dist/qrz-$DRONE_TAG-$GOOS-$GOARCH -mod=vendor -ldflags='-s -w' cmd/qrz/*.go"
-      - cd dist
-      - "tar -czvf qrz-$${DRONE_TAG}-$${GOOS}-$GOARCH.tar.gz"
   - name: release
     image: plugins/gitea-release
     settings:

ci-build.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+if [[ ! -z $DRONE_TAG && ! -z $GOOS && ! -z $GOARCH ]]
+then
+  mkdir dist
+  go build -o dist/qrz-${DRONE_TAG}-${GOOS}-${GOARCH} -mod=vendor -ldflags='-s -w' cmd/qrz/*.go
+  cd dist
+  tar -czvf qrz-${DRONE_TAG}-${GOOS}-${GOARCH}.tar.gz
+else
+  echo "Required variables not set"
+fi