[config] preliminary Dockerfile support

plugins/config/docker-args-deploy

@@ -7,15 +7,32 @@ config_docker_args() {
   declare desc="config docker-args plugin trigger"
   local trigger="$0 config_docker_args"
   local STDIN=$(cat); local APP="$1"; local IMAGE_TAG="$2"; local IMAGE=$(get_deploying_app_image_name "$APP" "$IMAGE_TAG")
-  local DOCKERFILE_ENV_FILE="$DOKKU_ROOT/$APP/DOCKERFILE_ENV_FILE"
   verify_app_name "$APP"
 
   if ! is_image_herokuish_based "$IMAGE"; then
-    > "$DOCKERFILE_ENV_FILE"
-    config_export global | sed -e "s:^export ::g" -e "s:=':=:g" -e "s:'$::g" > "$DOCKERFILE_ENV_FILE"
-    config_export app "$APP" | sed -e "s:^export ::g" -e "s:=':=:g" -e "s:'$::g" >> "$DOCKERFILE_ENV_FILE"
+    shopt -s extglob
+    local ENV_ARGS
+    declare -A ENV_ARGS
+    for key in $(config_keys global); do
+      VAR="$(config_get --global "$key")"
+      printf -vVAR '%q' "${VAR%%*( )}"
+      ENV_ARGS[$key]="$VAR"
+    done
+    for key in $(config_keys app "$APP"); do
+      VAR="$(config_get "$APP" "$key")"
+      printf -vVAR '%q' "${VAR%%*( )}"
+      ENV_ARGS[$key]="$VAR"
+    done
+    shopt -u extglob
+    local ALL_ENV_ARGS
+    declare -a ALL_ENV_ARGS
+    for key in "${!ENV_ARGS[@]}"; do
+      local ARG="$key=${ENV_ARGS[$key]}"
+      ALL_ENV_ARGS+=("--env")
+      ALL_ENV_ARGS+=("$ARG")
+    done
 
-    echo -n "$STDIN --env-file=$DOCKERFILE_ENV_FILE"
+    echo -n "$STDIN ${ALL_ENV_ARGS[@]}"
   else
     echo -n "$STDIN"
   fi