refactor: switch to main as default branch

.drone.yml

@@ -57,7 +57,7 @@ steps:
       from_secret: docker_username
   when:
     ref:
-    - refs/heads/master
+    - refs/heads/main
     - refs/tags/**
 
 - name: release
@@ -74,7 +74,7 @@ steps:
 
 trigger:
   ref:
-  - refs/heads/master
+  - refs/heads/main
   - refs/tags/**
   - refs/pull/**
 
@@ -110,7 +110,7 @@ steps:
 
 trigger:
   ref:
-  - refs/heads/master
+  - refs/heads/main
   - refs/tags/**
   status:
   - success

.github/settings.yml

@@ -11,7 +11,7 @@ repository:
   has_wiki: false
   has_downloads: false
 
-  default_branch: master
+  default_branch: main
 
   allow_squash_merge: true
   allow_merge_commit: true
@@ -47,7 +47,7 @@ labels:
     description: This will not be worked on
 
 branches:
-  - name: master
+  - name: main
     protection:
       required_pull_request_reviews: null
       required_status_checks:

README.md

@@ -25,4 +25,4 @@ docker build -f Dockerfile -t registry:latest .
 
 ## License
 
-This project is licensed under the Apache 2.0 License - see the [LICENSE](https://github.com/owncloud-ops/registry/blob/master/LICENSE) file for details.
+This project is licensed under the Apache 2.0 License - see the [LICENSE](https://github.com/owncloud-ops/registry/blob/main/LICENSE) file for details.