gitdb: add support for ServiceMethods

This release adds support for adding optional ServiceMethods permission lists to GitDB groups.

Fix repowatch to support anonymous repo access

Add params object interface in pkg/auth/userinfo/gitdb.
Fix pkg/git/repowatch to support anonymous repo access.
Copy various loggers from Dominator.

Upgrade repowatch Go sdk and fix subsequent pulls from repository.

Merge pull request #71 from rgooch/upgrade-repowatch-go-sdk

Upgrade repowatch Go sdk and fix subsequent pulls from repository.

Fix repowatch so it can use SSH key files pulled from AWS secrets.

Merge pull request #70 from rgooch/fix-repowatch

pkg/git/repowatch: fix pathname for keys fetched from AWS Secrets Man…

Fix repowatch so it can use SSH key files.

Merge pull request #69 from rgooch/add-repowatch

Add repowatch

Add repowatch package and Go modules support.

Merge pull request #66 from rgooch/add-repowatch

Add repowatch package and use it in the gitdb package. Initial Go modules setup.

OIDC improvements and AWS STS presigner support packages.

pkg/auth/oidc: add optional explicit login requirement
pkg/awsutil/presignauth: introduction

OIDC: Add logout page.

pkg/auth/oidc: add logout support.
oidc-test: add logout link.

Another quick fix for OIDC.

pkg/auth/oidc: tolerate missing AWS secret.

Quick fix for OIDC.

pkg/auth/oidc: make metadata optional as intended.