fix parser version check

Dockerfile

@@ -67,8 +67,8 @@ RUN date -u +"%Y-%m-%dT%H:%M:%SZ" > /app/deployed_at.txt
 # Copy parser hash from builder stage
 COPY --from=builder /tmp/parser_hash.txt /app/parser_hash.txt
 
-# Set parser git hash environment variable for runtime
-ENV PARSER_GIT_HASH=$(cat /app/parser_hash.txt)
+# Set default parser git hash environment variable
+ENV PARSER_GIT_HASH="unknown"
 
 # Copy release from builder
 COPY --from=builder --chown=nobody:root /app/release ./

lib/aprsme/dependency_info.ex

@@ -55,9 +55,24 @@ defmodule Aprsme.DependencyInfo do
   # Get static parser hash at compile time
   defp get_static_parser_hash do
     case System.get_env("PARSER_GIT_HASH") do
-      nil -> "unknown"
-      "unknown" -> "unknown"
-      hash -> hash
+      nil ->
+        "unknown"
+
+      "unknown" ->
+        # Try to read from the file copied during build
+        hash_file = Path.join(["/app", "parser_hash.txt"])
+
+        if File.exists?(hash_file) do
+          case File.read(hash_file) do
+            {:ok, hash} -> String.trim(hash)
+            _ -> "unknown"
+          end
+        else
+          "unknown"
+        end
+
+      hash ->
+        hash
     end
   end
 end