#14 Fix CI

Postgres: attempt using the official image. I haven't done this enough to know honestly and I may need a docker login regardless.
Dialyzer:
No longer supports `race_conditions`: jeremyjh/dialyxir#470.
Unknown is included by default I believe so there's no need to include it again.
Add MP3Stat exclusions tied to the line numbers. If I drastically change this file I need to follow the warnings too. I'm fine with making this whitelist as I don't think Beatseek had these checks applied or they may have taken different approaches.

.dialyzer_ignore.exs

@@ -5,4 +5,7 @@
 #
 # More info in the Dialyxir README:
 # https://github.com/jeremyjh/dialyxir#elixir-term-format
-[]
+[
+  {"lib/beatseek/mp3stat.ex", :call, 166},
+  {"lib/beatseek/mp3stat.ex", :guard_fail, 289},
+]

.github/workflows/elixir-build-and-test.yml

@@ -22,7 +22,7 @@ jobs:
     # Remove if you don't need a database
     services:
       db:
-        image: postgres/postgres:14
+        image: postgres:14
         env:
           POSTGRES_USER: postgres
           POSTGRES_PASSWORD: postgres

.github/workflows/nightly-integration-test.yml

@@ -19,7 +19,7 @@ jobs:
     # Remove if you don't need a database
     services:
       db:
-        image: postgres/postgres:14
+        image: postgres:14
         env:
           POSTGRES_USER: postgres
           POSTGRES_PASSWORD: postgres

mix.exs

@@ -22,7 +22,7 @@ defmodule Beatseek.MixProject do
       dialyzer: [
         ignore_warnings: ".dialyzer_ignore.exs",
         plt_file: {:no_warn, "priv/plts/dialyzer.plt"},
-        flags: [:error_handling, :race_conditions, :unknown],
+        flags: [:error_handling],
         # Error out when an ignore rule is no longer useful so we can remove it
         list_unused_filters: true
       ]