build(devcontainer): migrate onto the shared devbase Feature

.devcontainer/.dockerignore

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+# The devcontainer metadata is read by the CLI, not by the image build, so
+# keeping it out of the build context avoids a needless cache invalidation on
+# every edit to devcontainer.json.
+devcontainer.json
+devcontainer-lock.json
+env-info.conf

.devcontainer/Dockerfile

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+# Development image for this repository.
+#
+# Deliberately thin. The zsh configuration (prompt, autosuggestions) and
+# commitizen setup that used to be cloned and copied in from post-create.sh are
+# now in the devbase Feature:
+# https://github.com/centralnicgroup-opensource/rtldev-middleware-devcontainer-features
+#
+# The JDK and Maven come from the java devcontainer Feature, declared in
+# devcontainer.json, so this file does not pin a language image either.
+
+FROM mcr.microsoft.com/devcontainers/base:2-ubuntu-24.04
+
+# No ENV DEBIAN_FRONTEND here on purpose: set at image level it persists into the
+# running container, so an interactive `apt` in a shell session also loses its
+# frontend. A layer that needs it sets it for itself.
+ENV TERM=xterm-256color

.devcontainer/env-info.conf

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+# Drives the on-attach banner the devbase Feature prints. Sourced as shell, so
+# quote values containing spaces. Every setting is optional; see
+# https://github.com/centralnicgroup-opensource/rtldev-middleware-devcontainer-features
+
+TITLE="JAVA-SDK - development environment"
+
+SHOW_JAVA=true
+SHOW_NODE=auto
+
+# Node is here for the release tooling only, not for the product code.
+NODE_DEPS="semantic-release"
+
+EXTRA_ROWS="Maven|mvn --version|3"