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About expressions
You can use expressions to programmatically set environment variables in workflow files and access contexts. An expression can be any combination of literal values, references to a context, or functions. You can combine literals, context references, and functions using operators. For more information about contexts, see Contexts reference.
Expressions are commonly used with the conditional if keyword in a workflow file to determine whether a step should run. When an if conditional is true, the step will run.
You need to use specific syntax to tell GitHub to evaluate an expression rather than treat it as a string.
${{ <expression> }}
Note
The exception to this rule is when you are using expressions in an if clause, where, optionally, you can usually omit ${{ and }}. For more information about if conditionals, see Workflow syntax for GitHub Actions.
Warning
When creating workflows and actions, you should always consider whether your code might execute untrusted input from possible attackers. Certain contexts should be treated as untrusted input, as an attacker could insert their own malicious content. For more information, see Secure use reference.
Example setting an environment variable
env:
MY_ENV_VAR: ${{ <expression> }}
Further reading
For technical reference information about expressions you can use in workflows and actions, see Evaluate expressions in workflows and actions.