Add .tool-versions file (for release step)

iStefo · iStefo · commit 86a8a7a1be7e · 2025-08-28T13:50:14.000+02:00
diff --git a/.tool-versions b/.tool-versions
@@ -0,0 +1,2 @@
+elixir 1.18.4-otp-28
+erlang 28.0.2
