CI: add Linux arm64 runners

Author: greenrobot

.github/workflows/ci.yml

@@ -14,7 +14,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-latest, macos-latest, macos-26, windows-latest, windows-11-arm ]
+        # Available runners: https://docs.github.com/en/actions/reference/runners/github-hosted-runners
+        os: [ ubuntu-latest, ubuntu-24.04-arm, macos-latest, macos-26, windows-latest, windows-11-arm ]
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -29,7 +30,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-latest, macos-latest, macos-26, windows-latest, windows-11-arm ]
+        os: [ ubuntu-latest, ubuntu-24.04-arm, macos-latest, macos-26, windows-latest, windows-11-arm ]
     steps:
       - name: Checkout
         uses: actions/checkout@v4

.gitlab-ci.yml

@@ -17,6 +17,11 @@ build:rocky8:
   extends: build:ubuntu18
   image: objectboxio/cbuild-rocky8:2023-08-23
 
+build:linux-aarch64:
+  extends: build:ubuntu18
+  tags: [ armv8, shell, linux ]
+  image: null
+
 build:examples:
   stage: build
   tags: [x64, docker ]
@@ -39,3 +44,8 @@ build:examples-ubuntu24:
   extends: build:examples
   image: objectboxio/cbuild-ubuntu24.04:2025-09-30
   before_script: []
+
+build:examples-linux-aarch64:
+  extends: build:examples
+  tags: [ armv8, shell, linux ]
+  image: null