Updates to docker-compose.yaml and README.md to enabled CI and webhook to work as expected

- Update docker-compose.yaml to match service component naming so CI build-and-deploy process builds the expected container images and posts them correctly to the dployment webhook.
- Update docker-compose.yaml with additional comments.
- Update README.md with additional comments on build-and-deploy process.

Author: korlaxxalrok

README.md

@@ -203,6 +203,8 @@ Each environment is essentially a bunch of different services all governed by `d
 - A PR merged to either `development` or `master` will trigger CI to build container images that are then tagged (based on the branch name and ":latest" respectively) and stored in our GitHub Packages container image repository.
 - CI triggers a webhook that tells the host systems to pull and run new container images and restart any services that have been updated.
 
+**IMPORTANT!** - The CI/CD process uses Docker Compose to build the specific container images that will be used in external environments. Success of the the build-and-deploy workflow is dependent on constructed services in `docker-compose.yaml`. If considering making changes there, please have a PR reviewed by devops folks :pray: :pray: :pray:
+
 ### Control of the deployed environment
 
 The environment and secrets used for deployment live in <https://github.com/cmu-delphi/delphi-ansible-web>. Any changes to the environment should be made there and then tested and validated by devops folks.

docker-compose.yaml

@@ -18,14 +18,15 @@ services:
     ports:
       - "3306:3306"
 
+  # Production service - "service", "image", and "container_name" are important!
   sdwebapp:
-    image: ${REGISTRY}signal_documentation-webapp${TAG}
+    image: ${REGISTRY}signal_documentation-sdwebapp${TAG}
     build:
       context: .
 
     env_file:
       - ./.env
-    container_name: signal_documentation-webapp
+    container_name: signal_documentation-sdwebapp
     restart: on-failure
     command: sh -c "python3 /usr/src/signal_documentation/src/manage.py migrate --noinput &&
                     python3 /usr/src/signal_documentation/src/manage.py collectstatic --noinput &&
@@ -47,13 +48,14 @@ services:
     restart: always
     ports:
       - "6379:6379"
-
+  
+  # Production service - "service", "image", and "container_name" are important!
   sdnginx:
-    image: ${REGISTRY}signal_documentation-nginx${TAG}
+    image: ${REGISTRY}signal_documentation-sdnginx${TAG}
     build: ./nginx
     env_file:
       - ./.env
-    container_name: signal_documentation-nginx
+    container_name: signal_documentation-sdnginx
     restart: on-failure
     volumes:
       - ./src/staticfiles:/staticfiles
@@ -107,7 +109,7 @@ services:
 
 volumes:
   mysql:
-  webapp:
+  sdwebapp:
   static:
   celery:
   celery-beat: