github tests: adapt to github reply change

GitHub started adding to the JSON body also the HTTP status code.
This broke the tests, because the tests are brittle.

We should remove this brittleness from the tests, but this requires
more work.

github/commitstatus_test.go

@@ -401,7 +401,7 @@ func TestGitHubStatusFailureIntegration(t *testing.T) {
 			name:  "bad token: Unauthorized",
 			token: "bad-token",
 			wantErr: `failed to add state "success" for commit 751affd: 401 Unauthorized
-Body: {"message":"Bad credentials","documentation_url":"https://docs.github.com/rest"}
+Body: {"message":"Bad credentials","documentation_url":"https://docs.github.com/rest","status":"401"}
 Hint: Either wrong credentials or PAT expired (check your email for expiration notice)
 Action: POST https://api.github.com/repos/pix4d/cogito-test-read-write/statuses/751affd155db7a00d936ee6e9f483deee69c5922
 OAuth: X-Accepted-Oauth-Scopes: , X-Oauth-Scopes: `,
@@ -411,7 +411,7 @@ OAuth: X-Accepted-Oauth-Scopes: , X-Oauth-Scopes: `,
 			name: "non existing repo: Not Found",
 			repo: "non-existing-really",
 			wantErr: `failed to add state "success" for commit 751affd: 404 Not Found
-Body: {"message":"Not Found","documentation_url":"https://docs.github.com/rest/commits/statuses#create-a-commit-status"}
+Body: {"message":"Not Found","documentation_url":"https://docs.github.com/rest/commits/statuses#create-a-commit-status","status":"404"}
 Hint: one of the following happened:
     1. The repo https://github.com/pix4d/non-existing-really doesn't exist
     2. The user who issued the token doesn't have write access to the repo
@@ -424,7 +424,7 @@ OAuth: X-Accepted-Oauth-Scopes: repo, X-Oauth-Scopes: repo:status`,
 			name: "non existing SHA: Unprocessable Entity",
 			sha:  "e576e3aa7aaaa048b396e2f34fa24c9cf4d1e822",
 			wantErr: `failed to add state "success" for commit e576e3a: 422 Unprocessable Entity
-Body: {"message":"No commit found for SHA: e576e3aa7aaaa048b396e2f34fa24c9cf4d1e822","documentation_url":"https://docs.github.com/rest/commits/statuses#create-a-commit-status"}
+Body: {"message":"No commit found for SHA: e576e3aa7aaaa048b396e2f34fa24c9cf4d1e822","documentation_url":"https://docs.github.com/rest/commits/statuses#create-a-commit-status","status":"422"}
 Hint: none
 Action: POST https://api.github.com/repos/pix4d/cogito-test-read-write/statuses/e576e3aa7aaaa048b396e2f34fa24c9cf4d1e822
 OAuth: X-Accepted-Oauth-Scopes: , X-Oauth-Scopes: repo:status`,