Add arm mariner build images

src/cbl-mariner/2.0/cross/arm-alpine/Dockerfile

@@ -0,0 +1,10 @@
+FROM mcr.microsoft.com/dotnet-buildtools/prereqs:cbl-mariner-2.0-crossdeps-builder-local AS builder
+ARG ROOTFS_DIR=/crossrootfs/arm
+
+RUN /scripts/eng/common/cross/build-rootfs.sh arm alpine3.13 --skipunmount
+
+
+FROM mcr.microsoft.com/dotnet-buildtools/prereqs:cbl-mariner-2.0-crossdeps-arm-local
+ARG ROOTFS_DIR=/crossrootfs/arm
+
+COPY --from=builder $ROOTFS_DIR $ROOTFS_DIR

src/cbl-mariner/2.0/cross/arm/Dockerfile

@@ -0,0 +1,40 @@
+FROM mcr.microsoft.com/dotnet-buildtools/prereqs:cbl-mariner-2.0-crossdeps-builder-local AS builder
+ARG ROOTFS_DIR=/crossrootfs/arm
+
+RUN tdnf install -y debootstrap
+
+RUN /scripts/eng/common/cross/build-rootfs.sh arm xenial --skipunmount
+
+# Build compiler-rt profile library for PGO instrumentation
+RUN mkdir compiler-rt_build && cd compiler-rt_build && \
+    BUILD_FLAGS="-v --sysroot=$ROOTFS_DIR" \
+    TARGET_TRIPLE=arm-linux-gnueabihf && \
+    cmake ../llvm-project.src/compiler-rt \
+        -DCOMPILER_RT_BUILD_PROFILE=ON \
+        -DCOMPILER_RT_BUILD_BUILTINS=OFF \
+        -DCOMPILER_RT_BUILD_SANITIZERS=OFF \
+        -DCOMPILER_RT_BUILD_XRAY=OFF \
+        -DCOMPILER_RT_BUILD_LIBFUZZER=OFF \
+        \
+        -DCMAKE_C_COMPILER=clang \
+        -DCMAKE_CXX_COMPILER=clang++ \
+        -DCMAKE_EXE_LINKER_FLAGS="-fuse-ld=lld" \
+        -DCMAKE_C_COMPILER_TARGET=${TARGET_TRIPLE} \
+        -DCMAKE_CXX_COMPILER_TARGET=${TARGET_TRIPLE} \
+        -DLLVM_CONFIG_PATH=llvm-config \
+        -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DCMAKE_INSTALL_PREFIX=$ROOTFS_DIR/usr \
+        -DCMAKE_C_FLAGS="${BUILD_FLAGS}" \
+        -DCMAKE_CXX_FLAGS="${BUILD_FLAGS}" && \
+    make -j $(getconf _NPROCESSORS_ONLN)
+
+RUN LLVM_VERSION=12.0.1 LLVM_VERSION_MAJOR="${LLVM_VERSION%%.*}" && \
+    mkdir -p $ROOTFS_DIR/usr/lib/llvm-${LLVM_VERSION_MAJOR}/lib/clang/${LLVM_VERSION}/lib/linux/ && \
+    cp compiler-rt_build/lib/linux/libclang_rt.profile-armhf.a $ROOTFS_DIR/usr/lib/llvm-${LLVM_VERSION_MAJOR}/lib/clang/${LLVM_VERSION}/lib/linux/
+
+
+FROM mcr.microsoft.com/dotnet-buildtools/prereqs:cbl-mariner-2.0-crossdeps-arm-local
+ARG ROOTFS_DIR=/crossrootfs/arm
+
+COPY --from=builder $ROOTFS_DIR $ROOTFS_DIR

src/cbl-mariner/manifest.json

@@ -132,6 +132,32 @@
             }
           ]
         },
+        {
+          "platforms": [
+            {
+              "dockerfile": "src/cbl-mariner/2.0/cross/arm",
+              "os": "linux",
+              "osVersion": "cbl-mariner2.0",
+              "tags": {
+                "cbl-mariner-2.0-cross-arm-$(System:TimeStamp)-$(System:DockerfileGitCommitSha)": {},
+                "cbl-mariner-2.0-cross-arm$(FloatingTagSuffix)": {}
+              }
+            }
+          ]
+        },
+        {
+          "platforms": [
+            {
+              "dockerfile": "src/cbl-mariner/2.0/cross/arm-alpine",
+              "os": "linux",
+              "osVersion": "cbl-mariner2.0",
+              "tags": {
+                "cbl-mariner-2.0-cross-arm-alpine-$(System:TimeStamp)-$(System:DockerfileGitCommitSha)": {},
+                "cbl-mariner-2.0-cross-arm-alpine$(FloatingTagSuffix)": {}
+              }
+            }
+          ]
+        },
         {
           "platforms": [
             {