feat: add new command for Elixir expression evaluation

Currently, Elixir expressions are evaluated on an EMQX node using the
'eval' command, which works for both Erlang and Elixir expressions.
This commit adds the new command 'eval-ex' exclusively for evaluating
Elixir expressions on Elixir nodes, similar to 'eval-erl' for Erlang.

bin/emqx

@@ -164,6 +164,9 @@ usage() {
     eval-erl)
         echo "Evaluate an Erlang expression in the EMQX node, even on Elixir node"
         ;;
+    eval-ex)
+        echo "Evaluate an Elixir expression in the EMQX node. Only applies to Elixir node"
+        ;;
     versions)
         echo "List installed EMQX release versions and their status"
         ;;
@@ -228,7 +231,7 @@ usage() {
         echo "  Install Info:     ertspath | root_dir"
         echo "  Runtime Status:   pid | ping"
         echo "  Validate Config:  check_config"
-        echo "  Advanced:         console_clean | escript | rpc | rpcterms | eval | eval-erl"
+        echo "  Advanced:         console_clean | escript | rpc | rpcterms | eval | eval-erl | eval-ex"
         echo ''
         echo "Execute '$REL_NAME COMMAND help' for more information"
     ;;
@@ -1280,7 +1283,27 @@ case "${COMMAND}" in
         shift
         relx_nodetool "eval" "$@"
         ;;
+    eval-ex)
+        assert_node_alive
 
+        shift
+        if [ "$IS_ELIXIR" = "yes" ]
+        then
+          "$REL_DIR/elixir" \
+              --hidden \
+              --name "rand-$(relx_gen_id)-$NAME" \
+              --cookie "$COOKIE" \
+              --boot "$REL_DIR/start_clean" \
+              --boot-var RELEASE_LIB "$ERTS_LIB_DIR" \
+              --vm-args "$REL_DIR/remote.vm.args" \
+              --erl "-start_epmd false -epmd_module ekka_epmd" \
+              --rpc-eval "$NAME" "$@"
+        else
+            echo "EMQX node is not an Elixir node"
+            usage "$COMMAND"
+            exit 1
+        fi
+        ;;
     check_config)
         check_config
         ;;

changes/ce/feat-10263.en.md

@@ -0,0 +1 @@
+Add command 'eval-ex' for Elixir expression evaluation.