I have a Jenkinsfile in my repo, and one of the stages uses resources 
shared across every branch, but I need to limit it to only one build at a 
time. It seems that if two branches are being built simultaneously, they 
don't respect the concurrency parameter and end up using the shared 
resource at the same time.

I'd like the branch builds to wait until the other branch is out of that 
shared stage before entering, which is what i thought the concurrency 
parameter would do.

stage name: 'Source code checkout'
node {
    checkout scm
}

// Tests reuse the same resources
// I thought setting concurrency to 1 would avoid multiple branch builds 
stepping on each other
stage name: 'Test', concurrency: 1
node {
    // This doesn't seem to be limited to one branch build at a time
    // How can I achieve that?
}


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