Edeliver: Error when building release through GitHub Actions

So I’m trying to get Github Actions to build a release in a DO droplet. I’m able to SSH into the droplet using the SSH private key as the user config is using. I’m not really sure if the error is SSH-related or not.

action yml:

name: CD

on:
  push:
    branches: [ master ]

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v2
    - uses: actions/setup-elixir@v1
      with:
        otp-version: 22.3
        elixir-version: 1.10.2
    - uses: webfactory/ssh-agent@v0.2.0
      with:
        ssh-private-key: ${{ secrets.SSH_PRIVATE_KEY }}

    - name: Install dependencies
      run: mix deps.get

    - name: Build and deploy production release
      run: |
        mix edeliver build release production --verbose
        mix edeliver deploy release to production --verbose
        mix edeliver migrate production --verbose
        mix edeliver start production --verbose
      env:
        HOST: ${{ secrets.HOST }}
        USERNAME: ${{ secrets.USERNAME }}

edeliver logs:

-----> Ensuring hosts are ready to accept git pushes
bash is installed and the default shell
Initialized empty Git repository in /tmp/edeliver/app/builds/.git/
-----> Pushing new commits with git to: ***@***
error: src refspec master does not match any
error: failed to push some refs to '***@***:/tmp/edeliver/app/builds'

FAILED 1:
git push --tags -f ***@*** master

##[error]Process completed with exit code 1.

edeliver config:

#!/bin/bash

 APP="app"

 BUILD_HOST=$HOST
 BUILD_USER=$USERNAME
 BUILD_AT="/tmp/edeliver/$APP/builds"

 START_DEPLOY=true
 CLEAN_DEPLOY=true
 
 # prevent re-installing node modules; this defaults to "."
 GIT_CLEAN_PATHS="_build rel priv/static"

 PRODUCTION_HOSTS=$HOST
 PRODUCTION_USER=$USERNAME
 DELIVER_TO="/home/$USERNAME/apps"

 # For Phoenix projects, symlink prod.secret.exs to our tmp source
 pre_erlang_get_and_update_deps() {
   local _prod_secret_path="/home/$USERNAME/apps/$APP/secret/prod.secret.exs"
   if [ "$TARGET_MIX_ENV" = "prod" ]; then
     status "Linking '$_prod_secret_path'"
     __sync_remote "
       [ -f ~/.profile ] && source ~/.profile
       mkdir -p '$BUILD_AT'
       ln -sfn '$_prod_secret_path' '$BUILD_AT/config/prod.secret.exs'
     "
   fi
    }

 pre_erlang_clean_compile() {
   status "Running npm install"
     __sync_remote "
       [ -f ~/.profile ] && source ~/.profile
       set -e
       cd '$BUILD_AT'/assets
       npm install
     "

   status "Compiling assets"
      __sync_remote "
       [ -f ~/.profile ] && source ~/.profile
       set -e
       cd '$BUILD_AT'/assets
       node_modules/.bin/webpack --mode production --silent
     "

   status "Running phoenix.digest" # log output prepended with "----->"
   __sync_remote " # runs the commands on the build host
     [ -f ~/.profile ] && source ~/.profile # load profile (optional)
     set -e # fail if any command fails (recommended)
     cd '$BUILD_AT' # enter the build directory on the build host (required)
          # prepare something
     mkdir -p priv/static # required by the phoenix.digest task
     # run your custom task
     APP='$APP' MIX_ENV='$TARGET_MIX_ENV' $MIX_CMD phx.digest $SILENCE
     APP='$APP' MIX_ENV='$TARGET_MIX_ENV' $MIX_CMD phx.digest.clean $SILENCE
   "
 }