Fix github token (#9)

Author: dacoburn

src/core/scm/github.py

@@ -18,7 +18,7 @@
     log.warn("Unable to get PR number from event data, assuming not a PR")
     exit(0)
 commit_sha = os.getenv("GITHUB_SHA")
-gh_api_token = os.getenv("GH_API_TOKEN") or os.getenv("GITHUB_TOKEN") or os.getenv("github_token")
+gh_api_token = os.getenv("INPUT_GITHUB_TOKEN") or os.getenv("GITHUB_TOKEN") or os.getenv("github_token")
 working_directory = os.getenv("GITHUB_WORKSPACE")
 
 if working_directory is None: