Serverless framework is ignoring CLI options - amazon-web-services

Question

I'm trying to dynamically pass in options to resolve when deploying my functions with serverless but they're always null or hit the fallback.
custom:
send_grid_api: ${opt:sendgridapi, 'missing'}
SubscribedUsersTable:
name: !Ref UsersSubscriptionTable
arn: !GetAtt UsersSubscriptionTable.Arn
bundle:
linting: false
provider:
name: aws
lambdaHashingVersion: 20201221
runtime: nodejs12.x
memorySize: 256
stage: ${opt:stage, 'dev'}
region: us-west-2
environment:
STAGE: ${self:provider.stage}
SEND_GRID_API_KEY: ${self:custom.send_grid_api}
I've also tried:
environment:
STAGE: ${self:provider.stage}
SEND_GRID_API_KEY: ${opt:sendgridapi, 'missing'}
both yield 'missing', but why?
sls deploy --stage=prod --sendgridapi=xxx
also fails if I try with space instead of =.
Edit: Working Solution
In my github action template, I defined the following:
- name: create env file
run: |
touch .env
echo SEND_GRID_API_KEY=${{ secrets.SEND_GRID_KEY }} >> .env
ls -la
pwd
In addition, I explicitly set the working directory for this stage like so:
working-directory: /home/runner/work/myDir/myDir/
In my serverless.yml I added the following:
environment:
SEND_GRID_API_KEY: ${env:SEND_GRID_API_KEY}
sls will read the contents from the file and load them properly

Answer 1

opt is for serverless' CLI options. These are part of serverless, not your own code.
You can instead use...
provider:
...
environment:
...
SEND_GRID_API_KEY: ${env:SEND_GRID_API_KEY}
And pass the value as an environment variable in your deploy step.
- name: Deploy
run: sls deploy --stage=prod
env:
SEND_GRID_API_KEY: "insert api key here"