Command not found when SSHing into server via non-interactive session - github-actions

Question

I'm using a GitHub action to SSH into my staging server to pull the latest from the repo (which succeeds) then install node modules: yarn (which fails), build the app: yarn build:app (which fails), then restart the app: pm2 restart all (which fails). From what I've read from researching, the commands aren't found because the SSH into the server is a non-interactive session and many things aren't added to $PATH. I have tried adding export PATH="$PATH:/home/***/.nvm/versions/node/v14.5.0/bin/pm2:/home/***/.nvm/versions/node/v14.5.0/bin/pm2" to my script to no avail. I'm still getting command not found.
name: Test Deployment
on:
push:
branches:
- staging
jobs:
deploy:
runs-on: ubuntu-latest
steps:
- name: Deploy Staging
if: github.ref == 'refs/heads/staging'
uses: appleboy/ssh-action#master
with:
host: ${{ secrets.STAGING_SSH_HOST }}
username: ${{ secrets.STAGING_SSH_USERNAME }}
key: ${{ secrets.STAGING_SSH_KEY }}
passphrase: ${{ secrets.STAGING_SSH_PASSPHRASE }}
port: ${{ secrets.STAGING_SSH_PORT }}
script: |
export PATH="$PATH:/home/***/.nvm/versions/node/v14.5.0/bin/pm2:/home/***/.nvm/versions/node/v14.5.0/bin/pm2"
cd ~/***
git pull origin staging
yarn
yarn build:app
pm2 restart all
Receiving errors:
======CMD======
export PATH="$PATH:/home/***/.nvm/versions/node/v14.5.0/bin/pm2:/home/***/.nvm/versions/node/v14.5.0/bin/pm2"
cd ~/***
git pull origin staging
yarn
yarn build:app
pm2 restart all
======END======
err: From github.com:***/***
err: * branch staging -> FETCH_HEAD
err: *** staging -> origin/staging
out: Merge made by the 'recursive' strategy.
2021/04/16 21:28:17 Process exited with status 127
out: .github/workflows/main.yml | 2 +-
out: 1 file changed, 1 insertion(+), 1 deletion(-)
err: bash: line 3: yarn: command not found
err: bash: line 4: yarn: command not found
err: bash: line 5: pm2: command not found

Answer 1

Instead of
export path='$PATH:/home/***/.nvm/versions/node/v14.5.0/bin/pm2:/home/***/.nvm/versions/node/v14.5.0/bin/pm2'
you should try
export PATH="$PATH:/home/***/.nvm/versions/node/v14.5.0/bin/pm2:/home/***/.nvm/versions/node/v14.5.0/bin/pm2"
Notice:
PATH - uppercase
Use double quote instead of single quote to expand the previous value of PATH variable