add cleanup process (#224)

* add cleanup process

* save state

* update README/CHANGELOG

* fix message

* `getSshDirectory()` should not be exported

lib/index.js

@@ -2738,6 +2738,31 @@ catch (err) {
  * main function
  */
 function main() {
+    if (!isPost()) {
+        setup();
+        setPost();
+    }
+    else {
+        cleanup();
+    }
+}
+/**
+ * is post process?
+ * @returns Yes/No
+ */
+function isPost() {
+    return Boolean(core.getState("isPost"));
+}
+/**
+ * update post state
+ */
+function setPost() {
+    core.saveState("isPost", "true");
+}
+/**
+ * setup function
+ */
+function setup() {
     // parameters
     const key = core.getInput("key", {
         required: true,
@@ -2788,19 +2813,45 @@ function main() {
     }
     console.log(`SSH key has been stored to ${sshDirName} successfully.`);
 }
+/**
+ * cleanup function
+ */
+function cleanup() {
+    // remove ".ssh" directory
+    const sshDirName = removeSshDirectory();
+    console.log(`SSH key in ${sshDirName} has been removed successfully.`);
+}
 /**
  * create ".ssh" directory
  * @returns directory name
  */
 function createSshDirectory() {
-    const home = getHomeDirectory();
-    const dirName = path_1.default.resolve(home, ".ssh");
+    const dirName = getSshDirectory();
     fs_1.default.mkdirSync(dirName, {
         recursive: true,
         mode: 0o700,
     });
     return dirName;
 }
+/**
+ * remove ".ssh" directory
+ * @returns removed directory name
+ */
+function removeSshDirectory() {
+    const dirName = getSshDirectory();
+    fs_1.default.rmSync(dirName, {
+        recursive: true,
+        force: true,
+    });
+    return dirName;
+}
+/**
+ * get SSH directory
+ * @returns SSH directory name
+ */
+function getSshDirectory() {
+    return path_1.default.resolve(getHomeDirectory(), ".ssh");
+}
 /**
  * get home directory
  * @returns home directory name