Configure baseUrl in octokit initialisation (#91)

Make the action work for GHES by passing `GITHUB_API_URL` environment variable to octokit initialisation.

src/main.ts

@@ -1,4 +1,3 @@
-/* eslint-disable @typescript-eslint/no-unused-vars */
 import {getInput, setFailed} from '@actions/core'
 import {context} from '@actions/github'
 import {Input} from './input'

src/version/delete-version.ts

@@ -15,7 +15,8 @@ export function deletePackageVersion(
   token: string
 ): Observable<boolean> {
   const octokit = new Octokit({
-    auth: token
+    auth: token,
+    baseUrl: process.env.GITHUB_API_URL || 'https://api.github.com'
   })
   const package_version_id = +packageVersionId
   const package_type: PackageType = packageType as PackageType

src/version/get-versions.ts

@@ -31,7 +31,8 @@ export function getOldestVersions(
   token: string
 ): Observable<RestQueryInfo> {
   const octokit = new Octokit({
-    auth: token
+    auth: token,
+    baseUrl: process.env.GITHUB_API_URL || 'https://api.github.com'
   })
   const package_type: PackageType = packageType as PackageType