master -> main branch renaming

Author: amandel

.github/README-release.md

@@ -1,7 +1,7 @@
 ## Release Build
 
 The github action creates a draft release for every build on the
-master branch. You can publish any release from the master branch
+main branch. You can publish any release from the main branch
 as either "Pre-release" or final release upon publishing.
 
 Idea is to delete intermediate releases after a while manually.
@@ -14,9 +14,9 @@ care for the rest.
 Format of the version follows https://semver.org the 3 segment
 is automatically increased with every build by github or for
 local builds is `-dev`. Also builds from a other branch than 
-master get `-RC` as part of the version number.
+main get `-RC` as part of the version number.
 
-A typical master branch version looks like `v1.2.432` a build from
+A typical main branch version looks like `v1.2.432` a build from
 any temporary branch is `v1.2-RC433`. Please also note that the numeric 
 last part (patch) of github builds always increases and is never the 
 same for 2 different builds. 

.github/workflows/ci.yml

@@ -20,11 +20,11 @@
 #
 name: OpenBikeSensor - CI
 on:
-  # Trigger when pushing in master or pull requests, and when creating
+  # Trigger when pushing in main or pull requests, and when creating
   # a pull request.
   push:
     branches:
-      - master
+      - main
   pull_request:
     types: [opened, synchronize, reopened]
 
@@ -45,7 +45,7 @@ jobs:
         echo GITHUB Ref: ${{ github.ref }}
         VERSION_STRING=`grep "const char \*OBSVersion =" src/OpenBikeSensorFirmware.cpp`
         MAJOR=`echo ${VERSION_STRING} | cut -f2 -d\"`
-        if [ "${{ github.ref }}" = "refs/heads/master" ]
+        if [ "${{ github.ref }}" = "refs/heads/main" ]
         then
           PATCH=${GITHUB_RUN_NUMBER}
           SEPARATOR=.

.github/workflows/codeql-analysis.yml

@@ -13,10 +13,10 @@ name: "CodeQL"
 
 on:
   push:
-    branches: [ master ]
+    branches: [ main ]
   pull_request:
     # The branches below must be a subset of the branches above
-    branches: [ master ]
+    branches: [ main ]
   schedule:
     - cron: '37 23 * * 1'