Using environment variables

- Sometimes actions need additional information … provided to them at runtime. … This can be accomplished with environment variables. … Environment variables are dynamic key value pairs … stored in memory … on the virtual environment running our workflow. … Commands and actions running as steps … can access environment variables … to use the information stored there. … These values are read as the process runs. … In other words, they aren't already stored … in the virtual environment. … Instead, the values are injected … when the environment starts to run … and before any commands are called. … Environment variables are case sensitive … so when they're referenced in a workflow or step, … the reference needs to match the variable … exactly as its defined. … Github sets default environment variables … that are available to every step in a workflow. … These default variables start with GITHUT in all caps … with the exception of the home environment variable. … These defaults are helpful when actions need to know …