Adjust calculation of project version

It appears Git tags are not available during CI runs. Let's try a
different approach by having the CI write a 'VERSION' file and having
the Mix project read that if available.

Author: frerich

.github/workflows/release.yml

@@ -15,6 +15,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Write VERSION file
+        run: echo $REF_NAME > VERSION
+        env:
+          REF_NAME: ${{ github.ref_name }}
+
       - name: Set up Elixir
         uses: erlef/setup-beam@v1
         with:

mix.exs

@@ -66,9 +66,9 @@ defmodule PgLargeObjects.MixProject do
   defp dialyzer(_env), do: []
 
   defp version do
-    case System.cmd("git", ["describe", "--tags"]) do
-      {output, 0} -> String.trim(output)
-      _ -> nil
+    case File.read("VERSION") do
+      {:ok, output} -> String.trim(output)
+      _ -> "0.1.0-dev"
     end
   end
 end