How can I use branch-specific variables in Travis CI?

How can I use branch-specific variables in Travis CI?

You can define branch-specific variables in your .travis.yml file using the env key. For example, you can set different environment variables for different branches.

Can you give me an example of how to set that up?

Sure! Here's a simple example:

env:
  global:
    - COMMON_VAR=value
  matrix:
    - BRANCH=master
    - BRANCH=develop

jobs:
  include:
    - stage: test
      if: branch = master
      env: MASTER_VAR=value_for_master
    - stage: test
      if: branch = develop
      env: DEVELOP_VAR=value_for_develop

What happens if I push to a branch that isn't specified?

If you push to a branch that isn't specified in your .travis.yml, it will use the global environment variables defined under env: global.