Build for aarch64 linux hosts

Author: calebzulawski

.github/workflows/bazel.yml

@@ -15,6 +15,8 @@ jobs:
         host:
           - name: x86_64-unknown-linux-gnu
             runs-on: ubuntu-24.04
+          - name: aarch64-unknown-linux-gnu
+            runs-on: ubuntu-24.04-arm
           - name: x86_64-apple-macos
             runs-on: macos-13
           - name: arm64-apple-macos

.github/workflows/bazel_impl.yml

@@ -18,6 +18,8 @@ on:
 jobs:
 
   test-bazel-rules:
+    # TODO remove once toolchain is released
+    if: ${{ inputs.use-built-toolchain || inputs.host != 'aarch64-unknown-linux-gnu' }}
 
     name: test ${{ inputs.target }} target on ${{ inputs.host }} host
     runs-on: ${{ inputs.runs-on }}

.github/workflows/build-toolchain.yml

@@ -20,7 +20,7 @@ jobs:
           - name: armv7-unknown-linux-gnueabihf
             os: ubuntu-24.04
           - name: aarch64-unknown-linux-gnu
-            os: ubuntu-24.04
+            os: ubuntu-24.04-arm
     name: gcc ${{ matrix.target.name }}
     runs-on: ${{ matrix.target.os }}
     env:
@@ -71,7 +71,7 @@ jobs:
           - name: armv7-unknown-linux-gnueabihf
             os: ubuntu-24.04
           - name: aarch64-unknown-linux-gnu
-            os: ubuntu-24.04
+            os: ubuntu-24.04-arm
     name: sysroot ${{ matrix.target.name }}
     runs-on: ${{ matrix.target.os }}
     steps:
@@ -106,6 +106,9 @@ jobs:
           - name: x86_64-unknown-linux-gnu
             os: ubuntu-24.04
             type: linux
+          - name: aarch64-unknown-linux-gnu
+            os: ubuntu-24.04-arm
+            type: linux
           - name: x86_64-apple-macos
             os: macos-13
             type: macos

bazel/detail/assets/assets.json

@@ -14,6 +14,11 @@
     "url": "https://github.com/CACI-International/cpp-toolchain/releases/download/toolchain-2025.03.03/llvm-x86_64-unknown-linux-gnu.tar.xz",
     "integrity": "sha256-K8g0ZNcHXU/NEfxrL3376w1b7GCeSlO7XK+R2/C0HHw="
   },
+  {
+    "name": "llvm-aarch64-unknown-linux-gnu",
+    "url": "https://github.com/CACI-International/cpp-toolchain/releases/download/toolchain-2025.03.03/llvm-x86_64-unknown-linux-gnu.tar.xz",
+    "integrity": "sha256-K8g0ZNcHXU/NEfxrL3376w1b7GCeSlO7XK+R2/C0HHw="
+  },
   {
     "name": "sysroot-aarch64-unknown-linux-gnu",
     "url": "https://github.com/CACI-International/cpp-toolchain/releases/download/toolchain-2025.03.03/sysroot-aarch64-unknown-linux-gnu.tar.xz",