different approach to fetch upstream

.gitlab-ci.yml

@@ -1,25 +1,4 @@
-stages:
-    - prepare
-    - check
-    - build
-
 include:
     - project: dockerized/commons
       ref: master
       file: gitlab-ci-template.yml
-
-prepare:
-    image: registry.hottis.de/dockerized/base-build-env:latest
-    stage: prepare
-    tags:
-        - hottis
-        - linux
-        - docker
-    artifacts:
-        paths:
-            - tmp/unbound
-    script:
-        - mkdir tmp
-        - cd tmp
-        - git clone https://github.com/NLnetLabs/unbound.git
-

Dockerfile

@@ -1,6 +1,5 @@
 FROM alpine:3.13 AS builder
 
-COPY tmp/unbound/ tmp/unbound
 RUN \
   apk update && \
   apk add alpine-sdk && \
@@ -9,7 +8,10 @@ RUN \
   apk add openssl-dev && \
   apk add expat-dev && \
   apk add libevent-dev && \
-  cd tmp/unbound && \
+  mkdir tmp && \
+  cd tmp && \
+  git clone https://github.com/NLnetLabs/unbound.git && \
+  cd unbound && \
   ./configure --with-libnghttp2 --with-libevent --prefix /opt/unbound && \
   make && \
   make install