It reads the .env file from the root of this repo and provides environment variables to build steps.

Override the path to the .env file. Default is .env in the repository root.

Log variables after reading from the .env file.

Mask values after reading from the .env file.

Whatever is present in the .env file will be converted into an output variable.

E.g. you have the following .env:

VERSION=1.0
AUTHOR=Mickey Mouse

Then you will have outputs:

{
    version: "1.0"
    author: "Mickey Mouse"
}

id: dotenv
uses: ./.github/actions/dotenv-action

Then later you can refer to the alpine version like this ${{ steps.dotenv.outputs.version }}