Env variables for Vue.js in Nginx container

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The default approach for Vue.js is to use .env files during build stage. But I like more this one with envsubst. There is no need to rebuild image for each environment or when the configuration is changed.

Here is a small modification for entrypoint.sh, so it can replace all variables with VUE_APP_ prefix.

#!/bin/sh

function join_by { local IFS="$1"; shift; echo "$*"; }

# Find vue env vars
vars=$(env | grep VUE_APP_ | awk -F = '{print "$"$1}')
vars=$(join_by ' ' $vars)
echo "Found variables $vars"

for file in /dist/js/app.*;
do
  echo "Processing $file ...";

  # Use the existing JS file as template
  cp $file $file.tmpl
  envsubst "$vars" < $file.tmpl > $file
  rm $file.tmpl
done

exec "$@"