fix: Run dockerfile actions as the default Docker user

While we explicitly made the change to non-root users a year ago, the current GitHub docs state:

> Docker actions must be run by the default Docker user (root).

https://docs.github.com/en/actions/reference/workflows-and-actions/dockerfile-support

and we've observed issues in Enterprise GitHub environments.

Author: lnhrdt

CHANGELOG.md

@@ -9,6 +9,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- Run docker actions as the default Docker user.
+
 ## [1.2.0] - 2024-11-10
 
 ### Added

next-image-tag-number/Dockerfile

@@ -1,6 +1,4 @@
 FROM alpine:latest
 RUN apk add --update --no-cache --no-progress curl jq
-RUN adduser -u 1001 -D action
-USER action
 COPY action.sh /action.sh
 ENTRYPOINT ["/action.sh"]

set-imgpkg-bundle-as-vendir-path/Dockerfile

@@ -6,8 +6,5 @@ RUN apk add --update --no-cache --no-progress bash perl-utils \
     && wget -O- https://carvel.dev/install.sh | bash \
     && apk del bash perl-utils
 
-RUN adduser -u 1001 -D action
-USER action
-
 COPY action.sh /action.sh
 ENTRYPOINT ["/action.sh"]