build: Update CI infrastructure for "master" -> "main" rename

Also remove obsolete Travis build status from the README.md.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

.github/workflows/build.yaml

@@ -31,7 +31,7 @@ jobs:
 
       - name: Debug Check (default features)
         run: |
-          git rev-list origin/master..$GITHUB_SHA | xargs -t -I % sh -c 'git checkout %; cargo check --all --target=${{ matrix.target }}'
+          git rev-list origin/main..$GITHUB_SHA | xargs -t -I % sh -c 'git checkout %; cargo check --all --target=${{ matrix.target }}'
           git checkout $GITHUB_SHA
 
       - name: Build (acpi,kvm)

.github/workflows/docker-image.yaml

@@ -2,7 +2,7 @@ name: Cloud-Hypervisor's Docker image update
 
 on:
   push:
-    branches: master
+    branches: main
     paths: resources/Dockerfile
 
 jobs:

CONTRIBUTING.md

@@ -55,7 +55,7 @@ you want to merge your changes to `cloud-hypervisor`:
    into your github organization.
 2. Within your fork, create a branch for your contribution.
 3. [Create a pull request](https://help.github.com/articles/creating-a-pull-request-from-a-fork/)
-   against the master branch of the Cloud Hypervisor repository.
+   against the main branch of the Cloud Hypervisor repository.
 4. Add reviewers to your pull request and then work with your reviewers to address
    any comments and obtain minimum of 2 [maintainers](MAINTAINERS.md) approvals.
    To update your pull request amend existing commits whenever applicable and

Jenkinsfile

@@ -14,7 +14,7 @@ pipeline{
 					}
 				}
 				stage ('Cancel older builds') {
-					when { not { branch 'master' } }
+					when { not { branch 'main' } }
 					steps {
 						cancelPreviousBuilds()
 					}
@@ -110,7 +110,7 @@ pipeline{
 					agent { node { label 'bionic-sgx' } }
 					when {
 						beforeAgent true
-						branch 'master'
+						branch 'main'
 					}
 					stages {
 						stage ('Checkout') {
@@ -146,7 +146,7 @@ pipeline{
 					agent { node { label 'bionic-vfio' } }
 					when {
 						beforeAgent true
-						branch 'master'
+						branch 'main'
 					}
 					stages {
 						stage ('Checkout') {
@@ -221,15 +221,15 @@ pipeline{
 	post {
 		regression {
 			script {
-				if (env.BRANCH_NAME == 'master') {
-					slackSend (color: '#ff0000', message: '"master" branch build is now failing')
+				if (env.BRANCH_NAME == 'main') {
+					slackSend (color: '#ff0000', message: '"main" branch build is now failing')
 				}
 			}
 		}
 		fixed {
 			script {
-				if (env.BRANCH_NAME == 'master') {
-					slackSend (color: '#00ff00', message: '"master" branch build is now fixed')
+				if (env.BRANCH_NAME == 'main') {
+					slackSend (color: '#00ff00', message: '"main" branch build is now fixed')
 				}
 			}
 		}

README.md

@@ -1,5 +1,3 @@
-[![Build Status](https://travis-ci.com/cloud-hypervisor/cloud-hypervisor.svg?branch=master)](https://travis-ci.com/cloud-hypervisor/cloud-hypervisor)
-
 - [1. What is Cloud Hypervisor?](#1-what-is-cloud-hypervisor)
   - [Objectives](#objectives)
     - [High Level](#high-level)