chore: enforce linux line endings

Add .gitattributes and .editorconfig to enforce LF line endings. Update devcontainer settings.

.devcontainer/devcontainer.json

@@ -20,7 +20,8 @@
       ],
       "settings": {
         "editor.formatOnSave": true,
-        "editor.defaultFormatter": "esbenp.prettier-vscode"
+        "editor.defaultFormatter": "esbenp.prettier-vscode",
+        "files.eol": "\n"
       }
     }
   },

.devcontainer/setup.sh

@@ -5,7 +5,7 @@ git config --global --add safe.directory $(pwd)
 
 # In your setup.sh or postCreateCommand
 sudo chown -R node:node /home/node/.cache/
-sudo chown -R node:node .git/hooks
+sudo chown -R node:node /workspaces/screeps-deploy-action/.git/hooks
 # 2. Re-connect Git Hooks
 pre-commit install
 pre-commit install-hooks