getInput does not replace envs

[liudonghua123]

Describe the bug
I use a github action (https://github.com/xresloader/upload-to-github-release) to upload some files which the name contains some environment variable, but it seems getInput does not process envs replacement. getInput("file") got ${APP_NAME}-linux-1.0.0+1.zip in the following example.

      - uses: xresloader/upload-to-github-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          file: ${APP_NAME}-linux-${{ steps.branch_name.outputs.SOURCE_NAME }}.zip
          tags: true
          draft: false

Run xresloader/upload-to-github-release@v1
  with:
    file: ${APP_NAME}-linux-1.0.0+1.zip
    tags: true
    draft: false
    overwrite: false
    prerelease: false
    verbose: false
    update_latest_release: false
  env:
    APP_NAME: ynu_network_reset
    JAVA_HOME_8.0.272_x64: /opt/hostedtoolcache/jdk/8.0.272/x64
    JAVA_HOME: /opt/hostedtoolcache/jdk/8.0.272/x64
    JAVA_HOME_8_0_272_X64: /opt/hostedtoolcache/jdk/8.0.272/x64
    FLUTTER_HOME: /opt/hostedtoolcache/flutter/1.24.0-6.0.pre-dev/x64
    GITHUB_TOKEN: ***
Found tag to push: 1.0.0+1.
Error: Can not find any file by ${APP_NAME}-linux-1.0.0+1.zip

https://github.com/xresloader/upload-to-github-release/blob/fdd72e02aaa9581a25515ebc2d8ec0492efb635a/src/index.ts#L15

Expected behavior
getInput can process envs or provide some options for envs replacement.