Update packages & setup docker-compose to allow override.env file (#239)

## Ticket

## Changes
Updated Python packages

Add support for an override.env file

## Context for reviewers
These python package updates mirror similar ones we've done already on
Simpler Grants.gov, so not concerned with any of them.

The override.env file uses something added to Docker in January 2024:
https://docs.docker.com/reference/compose-file/services/#required - in
short, you can specify multiple .env files and have some be optional.
This way we can always say to look for override.env, but not require it,
and allow a user to write whatever they want to it without checking it
in.

## Testing
Locally I was able to create override.env, it not be added to git, and
the overrides worked (changed `LOG_FORMAT` to `json` and back).

---------

Co-authored-by: Kevin Boyer <kevinjboyer@gmail.com>

Author: chouinar

app/.gitignore

@@ -19,6 +19,7 @@ coverage.*
 # Environment variables
 .env
 .envrc
+override.env
 
 # mypy
 .mypy_cache

app/docker-compose.yml

@@ -24,7 +24,11 @@ services:
         - RUN_USER=${RUN_USER:-app}
     command: ["poetry", "run", "flask", "--app", "src.app", "run", "--host", "0.0.0.0", "--port", "8080", "--reload"]
     container_name: main-app
-    env_file: local.env
+    env_file:
+      - path: ./local.env
+        required: true
+      - path: ./override.env
+        required: false
     ports:
       - 8080:8080
     volumes:

app/local.env

@@ -1,6 +1,13 @@
 # Local environment variables
 # Used by docker-compose and it can be loaded
 # by calling load_local_env_vars() from app/src/util/local.py
+#
+# To override values for your own personal local development
+# create an override.env file in the same directory.
+# Any environment variables defined in that file will
+# take precedence over those defined here.
+#
+# See /docs/app/README.md for further details
 
 ENVIRONMENT=local
 PORT=8080