ci: rename master branch to main (#126)

Author: HKWinterhalter

.github/workflows/build.yml

@@ -2,7 +2,7 @@ name: Check compiled action script CI
 on:
   push:
     branches:
-    - master
+    - main
   pull_request:
 jobs:
   compile:
@@ -26,5 +26,5 @@ jobs:
     - name: Lint Code Base
       uses: github/super-linter@v4
       env:
-        DEFAULT_BRANCH: master
+        DEFAULT_BRANCH: main
         VALIDATE_JSON: true

.github/workflows/buildpack-integration-test.yml

@@ -71,7 +71,7 @@ on:
         # breaking changes
         description: Conformance GitHub Actions version by git ref
         type: string
-        default: 'master'
+        default: 'main'
         required: false
 jobs:
   # Download and cache the Functions Framework conformance test client

.github/workflows/main.yml

@@ -2,7 +2,7 @@ name: Conformance test framework validation CI
 on:
   push:
     branches:
-    - master
+    - main
   pull_request:
 jobs:
   run-conformance:

.github/workflows/unit.yml

@@ -2,7 +2,7 @@ name: Unit test CI
 on:
   push:
     branches:
-    - master
+    - main
   pull_request:
 jobs:
   test:

.gitignore

@@ -7,7 +7,7 @@ BUILD
 action/node_modules
 action/lib
 
-## From https://github.com/github/gitignore/blob/master/Go.gitignore
+## From https://github.com/github/gitignore/blob/main/Go.gitignore
 
 # Binaries for programs and plugins
 *.exe
@@ -19,7 +19,7 @@ action/lib
 # Test binary, built with `go test -c`
 *.test
 
-## From https://github.com/github/gitignore/blob/master/Node.gitignore
+## From https://github.com/github/gitignore/blob/main/Node.gitignore
 
 # Logs
 logs

docs/mapping.md

@@ -144,7 +144,7 @@ The GCF HTTP representation of Cloud PubSub events (events with a
 *gcf_service* of `pubsub.googleapis.com`) contain a `data` property
 which needs to be wrapped in an extra JSON object in the CloudEvent
 `data` attribute, to conform with the [expected CloudEvent
-representation](https://github.com/googleapis/google-cloudevents/blob/master/proto/google/events/cloud/pubsub/v1/data.proto).
+representation](https://github.com/googleapis/google-cloudevents/blob/main/proto/google/events/cloud/pubsub/v1/data.proto).
 
 So the CloudEvent should have: