From b127160dd54a9937fca8c13c4946162e6f213618 Mon Sep 17 00:00:00 2001
From: Gonzalo <456459+grzuy@users.noreply.github.com>
Date: Wed, 21 Aug 2024 11:29:16 -0300
Subject: [PATCH] ci: properly cache plts (2nd attempt)

---
 .github/workflows/ci.yml | 6 ++++++
 .gitignore               | 2 ++
 mix.exs                  | 3 +++
 3 files changed, 11 insertions(+)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 88a7630..efed9e0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,6 +28,12 @@ jobs:
             _build
             deps
           key: ${{ runner.os }}-${{ matrix.elixir }}-${{ matrix.erlang }}-${{ hashFiles('mix.lock') }}
+      - uses: actions/cache@v4
+        with:
+          # Don't cache PLTs based on mix.lock hash, as Dialyzer can incrementally update old ones
+          key: ${{ runner.os }}-${{ matrix.elixir }}-${{ matrix.erlang }}-plt
+          path: plts
+        if: ${{ matrix.lint }}
       - uses: erlef/setup-beam@v1
         with:
           otp-version: ${{ matrix.erlang }}
diff --git a/.gitignore b/.gitignore
index 0d255b6..71fc4c2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,3 +24,5 @@ tower-*.tar
 
 # Temporary files, for example, from tests.
 /tmp/
+
+/plts
diff --git a/mix.exs b/mix.exs
index 620a15c..2419e7c 100644
--- a/mix.exs
+++ b/mix.exs
@@ -15,6 +15,9 @@ defmodule Tower.MixProject do
       elixirc_paths: elixirc_paths(Mix.env()),
       deps: deps(),
       package: package(),
+      dialyzer: [
+        plt_local_path: "plts"
+      ],
 
       # Docs
       name: "Tower",