Rename default branch from master to main

.github/ISSUE_TEMPLATE/Bug_report.md

@@ -36,7 +36,7 @@ assignees: ''
 
 ### Configuration
 
-- Kanboard version: <!-- provide exact version (not master) -->
+- Kanboard version: <!-- provide exact version (not master or main) -->
 - Database type and version:
 - PHP version:
 - OS:

.github/workflows/docker.yml

@@ -16,7 +16,7 @@ jobs:
         id: docker_tag
         run: |
           SHORT_SHA=`echo ${GITHUB_SHA} | cut -c1-8`
-          APP_VERSION="master.${SHORT_SHA}"
+          APP_VERSION="main.${SHORT_SHA}"
           DOCKER_IMAGE=kanboard/kanboard
           DOCKER_VERSION=dev
           if [ "${{ github.event_name }}" = "schedule" ]; then

.github/workflows/integration_tests.yml

@@ -2,7 +2,7 @@ name: Integration Tests
 
 on:
   pull_request:
-    branches: [ master ]
+    branches: [ main ]
 
 jobs:
   Sqlite:

.github/workflows/linters.yml

@@ -2,7 +2,7 @@ name: Linters
 
 on:
   pull_request:
-    branches: [ master ]
+    branches: [ main ]
 
 jobs:
   jshint:

.github/workflows/unit_tests.yml

@@ -2,7 +2,7 @@ name: Unit Tests
 
 on:
   pull_request:
-    branches: [ master ]
+    branches: [ main ]
 
 jobs:
   Sqlite: