feat: add elixir-ls compatible with version 1.11 (#15)

1. Clone `elixir-ls` and set it to version [v0.12.0](https://github.com/elixir-lsp/elixir-ls/blob/master/CHANGELOG.md#v0120-7-november-2022)
2. Set up `neovim` to check `elixir` current elixir version and use the appropriate `elixir-ls`

Reviewed-on: #15

Dockerfile

@@ -176,6 +176,9 @@ RUN ${XDG_DATA_HOME}/rtx/bin/rtx plugins install \
     poetry \
     terraform
 
+# NOTE (jpd): the section below exists mainly to handle a project running elixir 1.11.
+# It allows the usage of openssl 1.1 and a compatible elixir-ls.
+
 # configure openssl 1.1
 # this is needed to compile older erlang versions
 # example: KERL_CONFIGURE_OPTIONS="-with-ssl=${HOME}/.local/lib/ssl" asdf install
@@ -188,3 +191,14 @@ RUN mkdir -p ${HOME}/.local/src \
   && make \
   # && make test \
   && make install
+
+# fetch elixir-ls compatible with elixir 1.11.x
+# to setup this project run the following commands:
+# mix do local.rebar --force, local.hex --force
+# mix do deps.get, deps.compile
+# MIX_ENV=prod mix compile
+# MIX_ENV=prod mix elixir_ls.release
+RUN git clone https://github.com/elixir-lsp/elixir-ls.git ${LOCAL_SRC_HOME}/elixir-ls \
+  && cd ${LOCAL_SRC_HOME}/elixir-ls \
+  && git checkout tags/v0.12.0 \
+  && cp .release-tool-versions .tool-versions

patch/kickstart.nvim/updates.patch

@@ -1,5 +1,5 @@
 diff --git a/init.lua b/init.lua
-index 748e7f8..47e327a 100644
+index 748e7f8145427b7f17639d4c9f978b9bbe47d2c9..7d05ed25928e7526b02da1671068cdaa24ebc240 100644
 --- a/init.lua
 +++ b/init.lua
 @@ -229,7 +229,7 @@ require('lazy').setup({
@@ -107,3 +107,25 @@ index 748e7f8..47e327a 100644
  }
  
  -- Setup neovim lua configuration
+@@ -542,12 +574,20 @@ mason_lspconfig.setup {
+ 
+ mason_lspconfig.setup_handlers {
+   function(server_name)
+-    require('lspconfig')[server_name].setup {
++    local opts = {
+       capabilities = capabilities,
+       on_attach = on_attach,
+       settings = servers[server_name],
+       filetypes = (servers[server_name] or {}).filetypes,
+     }
++    if server_name == 'elixirls' then
++      local version = vim.fn.system('rtx current elixir') or ''
++      local match_version = string.match(version, '^1.11')
++      if  match_version ~= nil then
++        opts = vim.tbl_extend('keep', opts, { cmd = { vim.fn.expand('$LOCAL_SRC_HOME') .. '/elixir-ls/release/language_server.sh' } })
++      end
++    end
++    require('lspconfig')[server_name].setup(opts)
+   end,
+ }
+