add aarch64 base for layer build

.github/workflows/layer-build.yaml

@@ -28,8 +28,17 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           context: .
-          file: layer-build/Dockerfile
+          file: layer-build/x86_64.Dockerfile
           platforms: linux/amd64
           push: true
           tags: |
-            ghcr.io/metalbear-co/ci-layer-build:latest
+            ghcr.io/metalbear-co/ci-layer-build:latest
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: layer-build/aarch64.Dockerfile
+          platforms: linux/amd64
+          push: true
+          tags: |
+            ghcr.io/metalbear-co/ci-layer-build-aarch64:latest

layer-build/aarch64.Dockerfile

@@ -0,0 +1,13 @@
+# Dockerfile used for building mirrord-layer for x64 with very old libc
+# this to support centos7 or Amazon Linux 2.
+
+FROM ghcr.io/cross-rs/aarch64-unknown-linux-gnu:main-centos
+
+# This fails to compile but tbh shouldn't really change so just stick with old always T_T
+RUN yum update -y && \
+    yum install centos-release-scl -y && \
+    yum install llvm-toolset-7 -y
+
+ENV LIBCLANG_PATH=/opt/rh/llvm-toolset-7/root/usr/lib64/ \
+    LIBCLANG_STATIC_PATH=/opt/rh/llvm-toolset-7/root/usr/lib64/ \
+    CLANG_PATH=/opt/rh/llvm-toolset-7/root/usr/bin/clang