perf: route registry traffic through LAN instead of internet

Use internal registry at 10.10.10.10:5050 instead of git.daddelolymp.de
which routes through Pangolin proxy over internet (40Mbit bottleneck).
All layer cache pulls/pushes and image pushes now stay on LAN.

.gitlab-ci.yml

@@ -2,7 +2,8 @@ stages:
   - build
 
 variables:
-  IMAGE_NAME: "$CI_REGISTRY/$CI_PROJECT_PATH"
+  INTERNAL_REGISTRY: "10.10.10.10:5050"
+  IMAGE_NAME: "$INTERNAL_REGISTRY/$CI_PROJECT_PATH"
   CI_SERVER_URL: "http://10.10.10.10:9080"
   GITLAB_FEATURES: ""
 
@@ -19,7 +20,7 @@ docker-build:
       cat > /kaniko/.docker/config.json <<EOF
       {
         "auths": {
-          "$CI_REGISTRY": {
+          "$INTERNAL_REGISTRY": {
             "username": "$CI_REGISTRY_USER",
             "password": "$CI_REGISTRY_PASSWORD"
           }
@@ -58,4 +59,5 @@ docker-build:
         --build-arg "VITE_APP_VERSION=$VERSION" \
         --cache=true \
         --cache-repo="$IMAGE_NAME/cache" \
+        --insecure-registry=$INTERNAL_REGISTRY \
         $DESTINATIONS