chore: add heroku config

Author: adalinesimonian

Aptfile

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+https://github.com/benbjohnson/litestream/releases/download/v0.3.13/litestream-v0.3.13-linux-amd64.deb

Procfile

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+worker: ./start.sh

start.sh

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+#!/bin/bash
+
+START_COMMAND=heimdallr
+
+set -e
+set -u
+set -x
+
+litestream version
+echo "DB_REPLICA_URL=${DB_REPLICA_URL}"
+
+readonly DB_PATH='heimdallr.db'
+
+if [[ -f "$DB_PATH" ]]; then
+  echo "Existing database is $(stat -c %s "${DB_PATH}") bytes"
+else
+  echo "Restoring database from replica"
+  litestream restore -if-replica-exists -v "${DB_PATH}"
+fi
+
+litestream replicate -exec "${START_COMMAND}"