kong-att: Source 42-kong-envs.sh

So that the `--yml` argument can be used with `--tag` in addition to
`--image`. Images created from tags, with Kong built from `make dev`,
don't have the `kong` binary on the default `PATH` and other Lua
environment variables set for non-interactive shells. This results in
the following error:

    kong-3-0-0-kong-1   | /bin/kong-att: 7: /bin/kong-att: kong: not found
    kong-3-0-0-kong-1   | ln: failed to create symbolic link '/kong/servroot/logs/access.log': No such file or directory
    kong-3-0-0-kong-1   | ln: failed to create symbolic link '/kong/servroot/logs/admin_access.log': No such file or directory
    kong-3-0-0-kong-1   | ln: failed to create symbolic link '/kong/servroot/logs/error.log': No such file or directory
    kong-3-0-0-kong-1   | nginx: [alert] could not open error log file: open() "/kong/servroot/logs/error.log" failed (2: No such file or directory)
    kong-3-0-0-kong-1   | 2022/12/04 21:58:57 [emerg] 1#0: open() "/kong/servroot/nginx.conf" failed (2: No such file or directory)
    kong-3-0-0-kong-1 exited with code 1

It can be reproduced with this `kong.yml`:

    _format_version: "2.1"
    _transform: true

    services:
    - name: httpbin
      url: http://httpbin:80
      routes:
      - name: httpbin
        paths:
        - /

And these commands to build a new image:

    gojira up --tag 3.0.0
    gojira run --tag 3.0.0 make dev
    gojira snapshot --tag 3.0.0
    gojira up --tag 3.0.0 --yml kong.yaml

The same steps should work, after deleting all Docker images/layers,
when running from this branch/commit.

docker/kong-att.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env sh
 
+. /etc/profile.d/42-kong-envs.sh
+
 hash nginx 2> /dev/null && ngx='nginx'
 ngx=${ngx:-"/usr/local/openresty/nginx/sbin/nginx"}