chore: allow to override erlang and elixir used to compile elixirls

With this change, it's possible to override the `erlang` and `elixir`
versions used to compile `elixir-ls`.

For example, to compile v0.24.1 with erlang 27.1.2 and elixir 1.17.3,
run the following:

```bash
./elixir-ls-setup.sh v0.24.1 27.1.2 1.17.3
```

scripts/elixir-ls-setup.sh

@@ -10,6 +10,14 @@ function setup() {
 	git checkout tags/${1}
 	echo "set erlang/elixir versions"
 	cp .release-tool-versions .tool-versions
+	if [[ ! -z "$2" ]]; then
+		echo "override erlang to ${2}"
+		sed -i "s/erlang .*/erlang ${2}/g" .tool-versions
+	fi
+	if [[ ! -z "$3" ]]; then
+		echo "override elixir to ${3}"
+		sed -i "s/elixir .*/elixir ${3}/g" .tool-versions
+	fi
 	local current_erlang=$(mise current erlang)
 	local current_elixir=$(mise current elixir)
 	echo "using erlang ${current_erlang} / elixir ${current_elixir}"
@@ -27,4 +35,4 @@ function setup() {
 	git checkout master
 }
 
-setup $1
+setup $1 $2 $3