Adding maven auth support

src/auth.ts

@@ -0,0 +1,31 @@
+import * as fs from 'fs';
+import * as os from 'os';
+import * as path from 'path';
+import * as core from '@actions/core';
+import * as io from '@actions/io';
+
+export async function configAuthentication(username: string, password: string) {
+  const directory: string = path.join(os.homedir(), '.m2');
+  await io.mkdirP(directory);
+  await write(directory, generate(username, password));
+}
+
+// only exported for testing purposes
+export function generate(
+  username = '${actions.username}',
+  password = '${actions.password}'
+) {
+  return `<settings>
+                <servers>
+                <server>
+                    <username>${username}</username>
+                    <password>${password}</password>
+                </server>
+                </servers>
+            </settings>
+    `;
+}
+
+async function write(directory: string, settings: string) {
+  return fs.writeFileSync(path.join(directory, 'settings.xml'), settings);
+}