Fix code review issues: remove deprecated version field, fix whitespace, improve error message

Co-authored-by: npv2k1 <[email protected]>

Author: Copilot

.github/workflows/docker.yml

@@ -27,7 +27,7 @@ jobs:
 
     - name: Test Docker image
       run: |
-        docker run --rm template-rust:test --version || echo "Version command not available"
+        docker run --rm template-rust:test --version || echo "Application does not support --version flag"
         docker run --rm template-rust:test --help
 
   docker-compose:

docker-compose.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   template-rust:
     build:

shell.nix

@@ -16,7 +16,6 @@ pkgs.mkShell {
 
     # Additional development tools
     git
-    
   ] ++ lib.optionals stdenv.isDarwin [
     # macOS specific dependencies
     darwin.apple_sdk.frameworks.Security