ci: use self-hosted images

Docker not support loongarch64 yet, so we need to build the alpine base
image ourself.

See docker-library/official-images#17607

.gitlab-ci.yml

@@ -5,6 +5,7 @@ stages:
 variables:
   GIT_STRATEGY: clone
   GIT_DEPTH: "500"
+  REGISTRY: registry.gitlab.org
 
 # only rune pipelines for merge requests or when tags are pushed  (for triggers)
 workflow:
@@ -14,7 +15,7 @@ workflow:
 
 lint:
   stage: verify
-  image: alpinelinux/apkbuild-lint-tools:latest
+  image: $REGISTRY/alpine/infra/docker/apkbuild-lint-tools:latest
   interruptible: true
   script:
     - lint
@@ -27,7 +28,8 @@ lint:
 
 .build:
   stage: verify
-  image: alpinelinux/alpine-gitlab-ci:latest
+  image:
+    name: $REGISTRY/alpine/infra/docker/alpine-gitlab-ci:latest
   interruptible: true
   script:
     - build.sh
@@ -53,7 +55,6 @@ build-x86_64:
 build-x86:
   extends: .build
   image:
-    name: alpinelinux/alpine-gitlab-ci:latest-x86
     entrypoint: ["linux32", "sh", "-c"]
   artifacts:
     name: MR${CI_MERGE_REQUEST_ID}_x86
@@ -92,7 +93,6 @@ build-aarch64:
 build-armv7:
   extends: .build
   image:
-    name: alpinelinux/alpine-gitlab-ci:latest-armv7
     entrypoint: ["linux32", "sh", "-c"]
   artifacts:
     name: MR${CI_MERGE_REQUEST_ID}_armv7
@@ -104,7 +104,6 @@ build-armv7:
 build-armhf:
   extends: .build
   image:
-    name: alpinelinux/alpine-gitlab-ci:latest-armhf
     entrypoint: ["linux32", "sh", "-c"]
   artifacts:
     name: MR${CI_MERGE_REQUEST_ID}_armhf