build: remove Docker proxy configuration from Gitlab build

This does not seem to be our job to setup that.

.gitlab-ci.yml

@@ -44,21 +44,6 @@ build docker image:
     - if: $CI_COMMIT_BRANCH == "main"
     - if: $CI_MERGE_REQUEST_ID
   script:
-    - |
-      mkdir -p ~/.docker
-      cat <<EOF > ~/.docker/config.json
-      {
-        "proxies":
-        {
-          "default":
-          {
-            "httpProxy": "$http_proxy",
-            "httpsProxy": "$https_proxy",
-            "noProxy": "127.0.0.1/8${NO_PROXY:+,}NO_PROXY${no_proxy:+,}$no_proxy"
-          }
-        }
-      }
-      EOF
     - docker info
     - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
     - docker build -f docker/Dockerfile -t $CI_REGISTRY_IMAGE:$CI_COMMIT_BRANCH$CI_MERGE_REQUEST_ID .