MONGOCRYPT-918 add musl arm64 signed release (#1179)

Author: kevinAlbs

.evergreen/config.yml

@@ -2022,9 +2022,12 @@ buildvariants:
   display_name: "Alpine Linux 3.23 arm64 (via Earthly)"
   expansions:
     earthly_env: alpine
+    release_os_arch: linux-arm64-musl_1_2-nocrypto
   tasks:
   - name: build-with-earthly
     run_on: ubuntu2404-arm64-latest-large
+  - name: upload-release
+    depends_on: build-with-earthly
 
 - name: debian11-arm64-earthly
   display_name: "Debian 11 arm64 (via Earthly)"