Update dockerfile to import images of dependent ecosystems

Author: AbhishekBhaskar

pre_commit/Dockerfile

@@ -1,23 +1,25 @@
 # syntax=docker.io/docker/dockerfile:1.20
-FROM docker.io/library/golang:1.25.0-bookworm AS go
+
+# Import pre-built ecosystem images to avoid code duplication
+# These images contain all the native helpers and tools already built
+FROM ghcr.io/dependabot/dependabot-updater-gomod AS go_modules
+FROM ghcr.io/dependabot/dependabot-updater-bundler AS bundler
 
 FROM ghcr.io/dependabot/dependabot-updater-core
 
 USER root
 
-COPY --from=go /usr/local/go /opt/go
+# Copy Go installation and helpers from go_modules image
+COPY --from=go_modules /opt/go /opt/go
+COPY --from=go_modules /opt/go_modules /opt/go_modules
 ENV PATH=/opt/go/bin:$PATH
 
 ENV DEPENDABOT_NATIVE_HELPERS_PATH="/opt"
 
-COPY go_modules/helpers /opt/go_modules/helpers
-RUN bash /opt/go_modules/helpers/build
+# Copy bundler helpers from bundler image (for Ruby additional_dependencies support)
+COPY --from=bundler --chown=dependabot:dependabot /opt/bundler /opt/bundler
 
 USER dependabot
 
-# Install bundler native helpers for Ruby additional_dependencies support
-COPY --chown=dependabot:dependabot bundler/helpers /opt/bundler/helpers
-RUN bash /opt/bundler/helpers/v2/build
-
 COPY --chown=dependabot:dependabot --parents go_modules cargo npm_and_yarn python pre_commit common bundler $DEPENDABOT_HOME/
 COPY --chown=dependabot:dependabot updater $DEPENDABOT_HOME/dependabot-updater