Merge branch 'bugfix/mix-dotgit' into 'develop'

mix: Check `.git` presence

See merge request pleroma/pleroma!3638

mix.exs

@@ -243,9 +243,10 @@ defmodule Pleroma.Mixfile do
     identifier_filter = ~r/[^0-9a-z\-]+/i
 
     git_available? = match?({_output, 0}, System.cmd("sh", ["-c", "command -v git"]))
+    dotgit_present? = File.exists?(".git")
 
     git_pre_release =
-      if git_available? do
+      if git_available? and dotgit_present? do
         {tag, tag_err} =
           System.cmd("git", ["describe", "--tags", "--abbrev=0"], stderr_to_stdout: true)
 
@@ -272,6 +273,7 @@ defmodule Pleroma.Mixfile do
     # Branch name as pre-release version component, denoted with a dot
     branch_name =
       with true <- git_available?,
+           true <- dotgit_present?,
            {branch_name, 0} <- System.cmd("git", ["rev-parse", "--abbrev-ref", "HEAD"]),
            branch_name <- String.trim(branch_name),
            branch_name <- System.get_env("PLEROMA_BUILD_BRANCH") || branch_name,