TIL that you can instruct docker-compose to fail if there are undefined or empty environment variables: ${VARIABLE:?err} exits with an error message containing err if VARIABLE is unset or empty in the environment. ${VARIABLE:err} exits with an error message containing err if VARIABLE is unset in the environment. Example:

services:
  postgres:
    container_name: postgres
    image: postgres:13.2
    environment:
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?Please set POSTGRES_PASSWORD}

invalid interpolation format for services.postgres.environment.POSTGRES_PASSWORD.
You may need to escape any $ with another $.
required variable POSTGRES_PASSWORD is missing a value: Please set POSTGRES_PASSWORD

Just wanted to show off a bit what I made 😉 maybe it'll give someone some interesting ideas. This is the internal dashboard I use to curate my newsletter. Articles on the left feed in from my feed aggregator, the content gets scraped for salient information using https://github.com/chimbori/crux, unwanted articles are filtered (currently just based on length), keywords are extracted using https://github.com/MaartenGr/KeyBERT, articles are saved and then loaded into the dash which is made using svelte (http://svelte.dev/). I can also generate summaries on demand using OpenAI's GPT-3. Everything is glued together using clojure. PS. picking the first article takes a while because I got distracted.