.github/workflows/macos.yml: add a libssh job with c-ares

... to enable the memdebug system

Closes #8720

.github/workflows/macos.yml

@@ -32,6 +32,10 @@ jobs:
           install: nghttp2 libssh2
           configure: --enable-debug --with-libssh2 --without-ssl
           macosx-version-min: 10.9
+        - name: libssh-c-ares
+          install: openssl nghttp2 libssh
+          configure: --enable-debug --with-libssh --with-openssl=/usr/local/opt/openssl --enable-ares
+          macosx-version-min: 10.9
         - name: libssh
           install: openssl nghttp2 libssh
           configure: --enable-debug --with-libssh --with-openssl=/usr/local/opt/openssl