DO NOT MERGE: add build jobs for all runners

let's find out which ones work!

.gitlab-ci.yml

@@ -37,13 +37,48 @@ workflow:
       - packages/
   timeout: 10 h
 
-build-aarch64:
+build-aarch64-runner1:
+  extends: .build
+  tags:
+  - runner1
+  script:
+    - .ci/build-aarch64.sh
+
+build-aarch64-runner2:
+  extends: .build
+  tags:
+  - runner2
+  script:
+    - .ci/build-aarch64.sh
+
+build-aarch64-runner3:
+  extends: .build
+  tags:
+  - runner3
+  script:
+    - .ci/build-aarch64.sh
+
+build-aarch64-runner4:
+  extends: .build
+  tags:
+  - runner4
+  script:
+    - .ci/build-aarch64.sh
+
+build-aarch64-runner5:
   extends: .build
   tags:
   - runner5
   script:
     - .ci/build-aarch64.sh
 
+build-aarch64-runner6:
+  extends: .build
+  tags:
+  - runner6
+  script:
+    - .ci/build-aarch64.sh
+
 auto-update:
   stage: autoupdate
   rules: