How to create environment variables in Github Actions using other variables

Question

I want to use the GITHUB_SHA with a variable, like this:

name: build
on: ["push"]

env:
  PACKAGE: package-$GITHUB_SHA

But, when I use, yaml does not expand the variable and I got the string. How I can do it?

Answer 1

According to https://help.github.com/en/actions/automating-your-workflow-with-github-actions/contexts-and-expression-syntax-for-github-actions#github-context:

As part of an expression, you may access context information using one of two syntaxes.

Index syntax: github['sha']
Property dereference syntax: github.sha

In this case:

name: build
on: ["push"]

env:
  PACKAGE: package-${{ github.sha }}

Answer 2

Try the following:

name: build
on: ["push"]

env:
  PACKAGE: package-${{ github.sha }}