refactor: remove support for the railpack no-cache property

This replicates the docker-options functionality.

docs/deployment/builders/railpack.md

@@ -89,28 +89,10 @@ dokku builder-railpack:set --global railpackjson-path
 
 ### Disabling cache
 
-Cache is enabled by default, but can be disabled by setting the `no-cache` property to `true`:
+Disable cache using the [docker-options] plugin:
 
 ```shell
-dokku builder-railpack:set node-js-app no-cache true
-```
-
-The default value may be set by passing an empty value for the option:
-
-```shell
-dokku builder-railpack:set node-js-app no-cache
-```
-
-The `no-cache` property can also be set globally. The global default is `false`, and the global value is used when no app-specific value is set.
-
-```shell
-dokku builder-railpack:set --global no-cache true
-```
-
-The default value may be set by passing an empty value for the option.
-
-```shell
-dokku builder-railpack:set --global no-cache
+dokku docker-options:add node-js-app build "--no-cache"
 ```
 
 ### Displaying builder-railpack reports for an app
@@ -126,23 +108,14 @@ dokku builder-railpack:report
        Builder-railpack computed railpackjson path: railpack2.json
        Builder-railpack global railpackjson path:   railpack.json
        Builder-railpack railpackjson path:          railpack2.json
-       Builder-railpack computed no cache:          true
-       Builder-railpack global no cache:            false
-       Builder-railpack no cache:                   true
 =====> python-sample builder-railpack information
        Builder-railpack computed railpackjson path: railpack.json
        Builder-railpack global railpackjson path:   railpack.json
        Builder-railpack railpackjson path:
-       Builder-railpack computed no cache:          false
-       Builder-railpack global no cache:            false
-       Builder-railpack no cache:
 =====> ruby-sample builder-railpack information
        Builder-railpack computed railpackjson path: railpack.json
        Builder-railpack global railpackjson path:   railpack.json
        Builder-railpack railpackjson path:
-       Builder-railpack computed no cache:          false
-       Builder-railpack global no cache:            false
-       Builder-railpack no cache:
 ```
 
 You can run the command for a specific app also.
@@ -156,17 +129,14 @@ dokku builder-railpack:report node-js-app
        Builder-railpack computed railpackjson path: railpack2.json
        Builder-railpack global railpackjson path:   railpack.json
        Builder-railpack railpackjson path:          railpack2.json
-       Builder-railpack computed no cache:          true
-       Builder-railpack global no cache:            false
-       Builder-railpack no cache:                   true
 ```
 
 You can pass flags which will output only the value of the specific information you want. For example:
 
 ```shell
-dokku builder-railpack:report node-js-app --builder-railpack-no-cache
+dokku builder-railpack:report node-js-app --builder-railpack-railpackjson-path
 ```
 
 ```
-true
+railpack2.json
 ```

plugins/builder-railpack/builder-build

@@ -35,7 +35,6 @@ trigger-builder-railpack-builder-build() {
 
   local DOCKER_ARGS=$(: | plugn trigger docker-args-build "$APP" "$BUILDER_TYPE")
   DOCKER_ARGS+=$(: | plugn trigger docker-args-process-build "$APP" "$BUILDER_TYPE")
-  [[ "$(fn-builder-railpack-computed-no-cache "$APP")" == "true" ]] && DOCKER_ARGS+=" --no-cache"
 
   DOCKER_ARGS=" $DOCKER_ARGS "
   eval set -- "$DOCKER_ARGS"

plugins/builder-railpack/internal-functions

@@ -38,9 +38,6 @@ cmd-builder-railpack-report-single() {
     "--builder-railpack-computed-railpackjson-path: $(fn-builder-railpack-computed-railpackjson-path "$APP")"
     "--builder-railpack-global-railpackjson-path: $(fn-builder-railpack-global-railpackjson-path "$APP")"
     "--builder-railpack-railpackjson-path: $(fn-builder-railpack-railpackjson-path "$APP")"
-    "--builder-railpack-computed-no-cache: $(fn-builder-railpack-computed-no-cache "$APP")"
-    "--builder-railpack-global-no-cache: $(fn-builder-railpack-global-no-cache "$APP")"
-    "--builder-railpack-no-cache: $(fn-builder-railpack-no-cache "$APP")"
   )
 
   if [[ -z "$INFO_FLAG" ]]; then
@@ -91,26 +88,3 @@ fn-builder-railpack-railpackjson-path() {
 
   fn-plugin-property-get "builder-railpack" "$APP" "railpackjson-path" ""
 }
-
-fn-builder-railpack-computed-no-cache() {
-  declare APP="$1"
-
-  file="$(fn-builder-railpack-no-cache "$APP")"
-  if [[ "$file" == "" ]]; then
-    file="$(fn-builder-railpack-global-no-cache "$APP")"
-  fi
-
-  echo "$file"
-}
-
-fn-builder-railpack-global-no-cache() {
-  declare APP="$1"
-
-  fn-plugin-property-get "builder-railpack" "--global" "no-cache" "false"
-}
-
-fn-builder-railpack-no-cache() {
-  declare APP="$1"
-
-  fn-plugin-property-get "builder-railpack" "$APP" "no-cache" ""
-}

plugins/builder-railpack/subcommands/set

@@ -9,13 +9,13 @@ cmd-builder-railpack-set() {
   declare cmd="builder-railpack:set"
   [[ "$1" == "$cmd" ]] && shift 1
   declare APP="$1" KEY="$2" VALUE="$3"
-  local VALID_KEYS=("railpackjson-path" "no-cache")
+  local VALID_KEYS=("railpackjson-path")
   [[ "$APP" == "--global" ]] || verify_app_name "$APP"
 
   [[ -z "$KEY" ]] && dokku_log_fail "No key specified"
 
   if ! fn-in-array "$KEY" "${VALID_KEYS[@]}"; then
-    dokku_log_fail "Invalid key specified, valid keys include: railpackjson-path, no-cache"
+    dokku_log_fail "Invalid key specified, valid keys include: railpackjson-path"
   fi
 
   if [[ -n "$VALUE" ]]; then