Rename branch from main to master

.github/workflows/ci.yaml

@@ -2,9 +2,9 @@ name: ci
 
 on:
   push:
-    branches: [main]
+    branches: [master]
   pull_request:
-    branches: [main]
+    branches: [master]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}

.vscode/settings.json

@@ -1,4 +1,4 @@
 {
-  "git.branchProtection": ["main"],
+  "git.branchProtection": ["master"],
   "git.branchProtectionPrompt": "alwaysCommitToNewBranch"
 }

README.md

@@ -14,7 +14,7 @@ Well, this dilema is very common to me, and that's why I created this shim.
 
 Although this shim can be used in many cases, some of the most common ones are:
 
-- [devcontainers](https://containers.dev/) with [docker-outside-of-docker](https://github.com/devcontainers/features/tree/main/src/docker-outside-of-docker#readme)
+- [devcontainers](https://containers.dev/) with [docker-outside-of-docker](https://github.com/devcontainers/features/tree/master/src/docker-outside-of-docker#readme)
 - StackOverflow: [Docker in Docker cannot mount volume](https://stackoverflow.com/questions/31381322)
 
 ## Highlights