reland "only use apple-m1 target for macos (#354)" (#357)

* Revert "Revert "only use apple-m1 target for macos (#354)" (#355)"

This reverts commit 933c6d5.

* sign treehashes

pipelines/scheduled/coverage/coverage.yml.signature

@@ -1 +1 @@
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+Salted__wK

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pipelines/scheduled/launch_signed_jobs.yml.signature

@@ -1 +1 @@
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utilities/build_envs.sh

@@ -18,7 +18,7 @@ if buildkite-agent meta-data exists BUILDKITE_JULIA_BRANCH; then
 fi
 
 # Determine JULIA_CPU_TARGETS for different architectures
-JUlIA_CPU_TARGETS=()
+JULIA_CPU_TARGETS=()
 case "${ARCH?}" in
     x86_64)
         JULIA_CPU_TARGETS+=(
@@ -54,20 +54,32 @@ case "${ARCH?}" in
         )
         ;;
     aarch64)
-        JULIA_CPU_TARGETS+=(
-            # Absolute base aarch64 feature set
-            "generic"
-            # Cortex A57, Example: NVIDIA Jetson TX1, Jetson Nano
-            "cortex-a57"
-            # Cavium ThunderX2T99, a common server architecture
-            "thunderx2t99"
-            # NVidia Carmel, e.g. Jetson AGX Xavier; serves as a baseline for later architectures
-            "carmel,clone_all"
-            # Apple M1
-            "apple-m1,base(3)"
-            # Vector-length-agnostic common denominator between Neoverse V1 and V2, recent Arm server architectures
-            "neoverse-512tvb,base(3)"
-        )
+        case "${OS?}" in
+            macos)
+                JULIA_CPU_TARGETS+=(
+                    # Absolute base aarch64 feature set
+                    "generic"
+                    # Apple M1
+                    "apple-m1,clone_all"
+                )
+                ;;
+            *)
+                JULIA_CPU_TARGETS+=(
+                    # Absolute base aarch64 feature set
+                    "generic"
+                    # Cortex A57, Example: NVIDIA Jetson TX1, Jetson Nano
+                    "cortex-a57"
+                    # Cavium ThunderX2T99, a common server architecture
+                    "thunderx2t99"
+                    # NVidia Carmel, e.g. Jetson AGX Xavier; serves as a baseline for later architectures
+                    "carmel,clone_all"
+                    # Apple M1
+                    "apple-m1,base(3)"
+                    # Vector-length-agnostic common denominator between Neoverse V1 and V2, recent Arm server architectures
+                    "neoverse-512tvb,base(3)"
+                )
+                ;;
+        esac
         ;;
     powerpc64le)
         JULIA_CPU_TARGETS+=(