feat(authenticate): add approle auth method (#10)

* feat(authenticate): add approle auth method

* docs(readme): update readme

* fix: update index.js

* fix: update got to 10.2.2 to fix ncc

* chore: clean up code slightly

* chore: update tests to use got correctly

* chore(test): fix integration tests

* chore: streamline method logic

* chore: make role and secret required in approle

Co-authored-by: Sébastien FAUVART <sebastien.fauvart@gmail.com>
Co-authored-by: Richard Simpson <richardsimpson@outlook.com>

README.md

@@ -22,6 +22,26 @@ jobs:
             # ...
 ```
 
+## Authentication method
+
+The `method` parameter can have these value :
+- **token**: (by default) you must provide a token parameter
+```yaml
+...
+with:
+  url: https://vault.mycompany.com:8200
+  token: ${{ secrets.VaultToken }}
+```
+- **approle**: you must provide a roleId & secretId parameter
+```yaml
+...
+with:
+  url: https://vault.mycompany.com:8200
+  method: approle
+  roleId: ${{ secrets.roleId }}
+  secretId : ${{ secrets.secretId }}
+```
+
 ## Key Syntax
 
 The `secrets` parameter is a set of multiple secret requests separated by the `;` character.
@@ -84,6 +104,7 @@ steps:
       uses: RichiCoder1/vault-action
       with:
         url: https://vault-enterprise.mycompany.com:8200
+        method: token
         token: ${{ secrets.VaultToken }}
         namespace: ns1
         secrets: |