Add .dockerignore to file exclusions

This commit adds '**/.dockerignore' to the file exclusions in src/fileExclusions.ts. Additionally, it updates the version in package.json from 1.0.12 to 1.0.13 to reflect this change.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "code-tokenizer-md",
-  "version": "1.0.12",
+  "version": "1.0.13",
   "type": "module",
   "main": "src/index.ts",
   "module": "src/index.ts",

src/fileExclusions.ts

@@ -9,6 +9,7 @@ export default [
   '**/jsconfig*.json',
   '**/package-lock.json',
   '**/.prettierignore',
+  '**/.dockerignore',
   // Environment and variables
   '**/.env*',
   '**/*.vars',