feat: properly export env vars for cnb apps

They are not baked into the image like they are for herokuish, so we need to manually set them via --env. Additionally, due to newline constraints in docker, we need to use `--env=key` format to correctly pull the values into place.

plugins/config/docker-args-deploy

@@ -14,8 +14,8 @@ trigger-config-docker-args() {
   STDIN=$(cat)
   trigger="$0 config_docker_args"
 
-  if ! is_image_herokuish_based "$IMAGE" "$APP"; then
-    ENV_ARGS="$(config_export app "$APP" --format docker-args --merged)"
+  if ! is_image_herokuish_based "$IMAGE" "$APP" || is_image_cnb_based "$IMAGE"; then
+    ENV_ARGS="$(config_export app "$APP" --format docker-args-keys --merged)"
     echo -n "$STDIN $ENV_ARGS"
   else
     echo -n "$STDIN"

plugins/scheduler-docker-local/scheduler-deploy

@@ -222,6 +222,7 @@ fn-start-app-container() {
 
   declare -a __DOKKU_DOCKER_ARG_ARRAY
   eval "__DOKKU_DOCKER_ARG_ARRAY=($DOCKER_ARGS)"
+  eval "$(config_export app "$APP")"
   "$DOCKER_BIN" container create "${__DOKKU_DOCKER_ARG_ARRAY[@]}"
 }