Fix CI

.gitlab-ci.yml

@@ -6,6 +6,7 @@ build-windows-amd64:
   image: golang:alpine
   stage: build
   script:
+   - apk --no-cache add git
    - go get -d
    - GOOS=windows go build -o godns.exe
   artifacts:
@@ -35,7 +36,7 @@ build-linux-arm:
     - godns-arm
 
 build-linux-arm64:
-  image: golang
+  image: golang:alpine
   stage: build
   script:
    - apk --no-cache add git