Enable heroku exec

[georgehelman]

No description provided.

[copelco]

This didn't work for me:

COMPOSE_FILE=docker-compose.deploy.yml docker compose up --build -d django
[+] Building 161.5s (30/31)
...
 => ERROR [deploy 3/4] RUN echo '[ -z "$SSH_CLIENT" ] && source <(curl --fail --retry 3 -sSL "$HEROKU_EXEC_URL")' > /app/.profile.d                                         0.5s
------
 > [deploy 3/4] RUN echo '[ -z "$SSH_CLIENT" ] && source <(curl --fail --retry 3 -sSL "$HEROKU_EXEC_URL")' > /app/.profile.d:
#0 0.431 /bin/sh: 1: cannot create /app/.profile.d: Directory nonexistent
------
failed to solve: executor failed running [/bin/sh -c echo '[ -z "$SSH_CLIENT" ] && source <(curl --fail --retry 3 -sSL "$HEROKU_EXEC_URL")' > /app/.profile.d]: exit code: 2

But I agree it will be valuable to get working.