How to get feature branch to build on master when pipeline deployment to Heroku?

[GregE]

Say I have a feature branch `feature/my-feature` and using pipelines I want to deploy to a Heroku app called `dev-server`.

My pipelines config has the branch config:

branches:
  feature/*:
    - step: 
       name: Build feature branch and push to Heroku dev server 
       deployment: test 
       script:
         - npm install 
         - git push https://heroku:$HEROKU_API_KEY@git.heroku.com/$HEROKU_APP_NAME_DEV.git HEAD

When deploying, logs say:

+ git push https://heroku:$HEROKU_API_KEY@git.heroku.com/$HEROKU_APP_NAME_DEV.git HEAD
remote: Pushed to non-master branch, skipping build.

And the app does not get built on the Heroku server.

Apparently this is because Heroku needs the app to be built on the master branch.

What should the git push command be to have the build occur on the master branch?

I tried replacing "HEAD" with "master" but the build failed with error

+ git push https://heroku:$HEROKU_API_KEY@git.heroku.com/$HEROKU_APP_NAME_DEV.git master
error: src refspec master does not match any.

[GregE · Accepted solution]

Figured it out: using HEAD:master works.

[ashinzekene]

+ git push https://heroku:$HEROKU_API_KEY@git.heroku.com/$HEROKU_APP_NAME_DEV.git HEAD:master

Like this?

[ashinzekene]

A mistake. I can't delete comments???