Add Linux ARM64 badges to README

Author: jmid

README.md

@@ -11,6 +11,7 @@ Multicore tests
 [![Linux 5.2.1-musl](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-52x-musl.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-52x-musl.yml)
 [![Linux 32-bit 5.2.1](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-52x-32bit.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-52x-32bit.yml)
 [![Linux FP 5.2.1](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-52x-fp.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-52x-fp.yml)
+[![Linux ARM64 5.2.1](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-52x-arm64.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-52x-arm64.yml)
 [![MinGW 5.2.1](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-52x.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-52x.yml)
 [![MinGW 5.2.1-bytecode](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-52x-bytecode.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-52x-bytecode.yml)
 [![Cygwin 5.2.1](https://github.com/ocaml-multicore/multicoretests/actions/workflows/cygwin-52x.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/cygwin-52x.yml)
@@ -23,6 +24,7 @@ Multicore tests
 [![Linux 5.3.0+trunk-musl](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-530-trunk-musl.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-530-trunk-musl.yml)
 [![Linux 32-bit 5.3.0+trunk](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-530-trunk-32bit.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-530-trunk-32bit.yml)
 [![Linux FP 5.3.0+trunk](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-530-trunk-fp.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-530-trunk-fp.yml)
+[![Linux ARM64 5.3.0+trunk](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-530-trunk-arm64.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-530-trunk-arm64.yml)
 [![MinGW 5.3.0+trunk](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-530-trunk.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-530-trunk.yml)
 [![MinGW 5.3.0+trunk-bytecode](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-530-trunk-bytecode.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-530-trunk-bytecode.yml)
 [![Cygwin 5.3.0+trunk](https://github.com/ocaml-multicore/multicoretests/actions/workflows/cygwin-530-trunk.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/cygwin-530-trunk.yml)
@@ -37,6 +39,7 @@ Multicore tests
 [![Linux 5.4.0+trunk-musl](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-540-trunk-musl.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-540-trunk-musl.yml)
 [![Linux 32-bit 5.4.0+trunk](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-540-trunk-32bit.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-540-trunk-32bit.yml)
 [![Linux FP 5.4.0+trunk](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-540-trunk-fp.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-540-trunk-fp.yml)
+[![Linux ARM64 5.4.0+trunk](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-540-trunk-arm64.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-540-trunk-arm64.yml)
 [![MinGW 5.4.0+trunk](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-540-trunk.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-540-trunk.yml)
 [![MinGW 5.4.0+trunk-bytecode](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-540-trunk-bytecode.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-540-trunk-bytecode.yml)
 [![Cygwin 5.4.0+trunk](https://github.com/ocaml-multicore/multicoretests/actions/workflows/cygwin-540-trunk.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/cygwin-540-trunk.yml)