Move from ubuntu to distroless image (#31136)

* Move from ubuntu to distroless image

* Update updated ubunty image for first stage

* Update server/build/Dockerfile

Co-authored-by: Daniel Schalla <daniel@mattermost.com>

* Update server/build/Dockerfile

Co-authored-by: Daniel Schalla <daniel@mattermost.com>

* Add mising env var for health check

* Add mattermost user in /etc/passwd

* Fix e2e userId

* use cypress in place of server. Wget and not curl

* Simplify e2e changes

---------

Co-authored-by: Daniel Schalla <daniel@mattermost.com>

server/build/Dockerfile

@@ -1,11 +1,8 @@
-FROM ubuntu:noble-20240605@sha256:2e863c44b718727c860746568e1d54afd13b2fa71b160f5cd9058fc436217b30
-
+# First stage - Ubuntu with document processing dependencies and curl for downloading
+FROM ubuntu:noble-20250415.1@sha256:dc17125eaac86538c57da886e494a34489122fb6a3ebb6411153d742594c2ddc AS builder
 # Setting bash as our shell, and enabling pipefail option
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
-# Some ENV variables
-ENV PATH="/mattermost/bin:${PATH}"
-
 # Build Arguments
 ARG PUID=2000
 ARG PGID=2000
@@ -13,7 +10,7 @@ ARG PGID=2000
 # i.e. https://releases.mattermost.com/9.7.1/mattermost-9.7.1-linux-amd64.tar.gz
 ARG MM_PACKAGE="https://latest.mattermost.com/mattermost-enterprise-linux"
 
-# # Install needed packages and indirect dependencies
+# Install needed packages and indirect dependencies
 RUN apt-get update \
   && DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y \
   ca-certificates \
@@ -34,18 +31,48 @@ RUN mkdir -p /mattermost/data /mattermost/plugins /mattermost/client/plugins \
   && curl -L $MM_PACKAGE | tar -xvz \
   && chown -R mattermost:mattermost /mattermost /mattermost/data /mattermost/plugins /mattermost/client/plugins
 
+# Final stage using distroless for minimal attack surface
+FROM gcr.io/distroless/base-debian12
+
+# Some ENV variables
+ENV PATH="/mattermost/bin:${PATH}"
+ENV MM_SERVICESETTINGS_ENABLELOCALMODE="true"
+
+# Copy over metadata files needed by runtime
+COPY --from=builder /etc/mime.types /etc
+
+# Copy document processing utilities and necessary support files
+COPY --from=builder /usr/bin/pdftotext /usr/bin/pdftotext
+COPY --from=builder /usr/bin/wvText /usr/bin/wvText
+COPY --from=builder /usr/bin/wvWare /usr/bin/wvWare
+COPY --from=builder /usr/bin/unrtf /usr/bin/unrtf
+COPY --from=builder /usr/bin/tidy /usr/bin/tidy
+COPY --from=builder /usr/share/wv /usr/share/wv
+
+# Copy necessary libraries for document processing utilities
+COPY --from=builder /usr/lib/libpoppler.so* /usr/lib/
+COPY --from=builder /usr/lib/libfreetype.so* /usr/lib/
+COPY --from=builder /usr/lib/libpng.so* /usr/lib/
+COPY --from=builder /usr/lib/libwv.so* /usr/lib/
+COPY --from=builder /usr/lib/libtidy.so* /usr/lib/
+COPY --from=builder /usr/lib/libfontconfig.so* /usr/lib/
+
+# Copy mattermost from builder stage 
+COPY --from=builder --chown=2000:2000 /mattermost /mattermost
+
+# Copy passwd including mattermost user
+COPY  passwd /etc/passwd
+
 # We should refrain from running as privileged user
 USER mattermost
 
-# Healthcheck to make sure container is ready
+# Healthcheck to make sure container is ready - using mmctl instead of curl for distroless compatibility
 HEALTHCHECK --interval=30s --timeout=10s \
-  CMD curl -f http://localhost:8065/api/v4/system/ping || exit 1
+  CMD ["/mattermost/bin/mmctl", "system", "status", "--local"]
 
 # Configure entrypoint and command with proper permissions
-COPY --chown=mattermost:mattermost --chmod=765 entrypoint.sh /
-ENTRYPOINT ["/entrypoint.sh"]
 WORKDIR /mattermost
-CMD ["mattermost"]
+CMD ["/mattermost/bin/mattermost"]
 
 EXPOSE 8065 8067 8074 8075