[CLD-3942] Container Image used for e2e testing, migration from Alpine to Debian Linux (#20807)

* [fix] Dockerfile using Debian instead of Alpine

We are switching to building docker container for Matermmost-server & enterprise
from Alpine Linux(unsupported) to Debian(supported)

This image is used for e2e testing.

Rationalle:
Alpine is actually unsupported distro for Mattermost-server. https://docs.mattermost.com/install/software-hardware-requirements.html#mattermost-server-operating-system
On top of that, Alpine linux uses musl libc vs glibc, which can cause several issues when testing
Finally We got to a point of being unable to run Alpine based mattermost instances with: `Error relocating ./mattermost: fcntl64: symbol not found`
Details @ https://github.com/mattermost/mattermost-server/pull/20735

Specifically the following changes are introduced:

- switching to using Debian Buster as being a supported linux flavor for Mattermost
- pinning the Debian base image with SHA hash
- defining Shell as bash, and enabling pipefail
- pinning additional packages installed using apt
- removing unused cache
- improving MM_PACKAGE variable checking logic introducing non zero exit code (127) when failing
- migrating adduser and addgroup command, to debian compatible
- removing unused chown dirs

Signed-off-by: Akis Maziotis <akis.maziotis@mattermost.com>

* [fix] Using bash as a more capable shell

* [fix] Installing optional packages needed for tests

These packages are needed to perform succesfull end to end testing.
Relevant documentation:
https://docs.mattermost.com/configure/file-storage-configuration-settings.html#enable-document-search-by-content

Signed-off-by: Akis Maziotis <akis.maziotis@mattermost.com>

build/Dockerfile

@@ -1,4 +1,7 @@
-FROM alpine:3.14.6@sha256:06b5d462c92fc39303e6363c65e074559f8d6b1363250027ed5053557e3398c5
+FROM debian:buster-slim@sha256:5b0b1a9a54651bbe9d4d3ee96bbda2b2a1da3d2fa198ddebbced46dfdca7f216
+
+# Setting bash as our shell, and enabling pipefail option
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
 # Some ENV variables
 ENV PATH="/mattermost/bin:${PATH}"
@@ -6,38 +9,33 @@ ARG PUID=2000
 ARG PGID=2000
 ARG MM_PACKAGE="https://releases.mattermost.com/7.1.2/mattermost-7.1.2-linux-amd64.tar.gz?src=docker"
 
+# # Install needed packages
+RUN apt-get update \
+  && apt-get install --no-install-recommends -y \
+  ca-certificates=20200601~deb10u2 \
+  curl=7.64.0-4+deb10u2 \
+  mime-support=3.62 \
+  unrtf=0.21.10-clean-1 \
+  wv=1.2.9-4.2+b2 \
+  poppler-utils=0.71.0-5 \
+  tidy=2:5.6.0-10 \
+  && rm -rf /var/lib/apt/lists/*
 
-# Install some needed packages
-RUN apk add --no-cache \
-  ca-certificates \
-  curl \
-  libc6-compat \
-  libffi-dev \
-  linux-headers \
-  mailcap \
-  netcat-openbsd \
-  xmlsec-dev \
-  tzdata \
-  wv \
-  poppler-utils \
-  tidyhtml \
-  && rm -rf /tmp/*
-
-# Get Mattermost
+# Set mattermost group/user and download Mattermost
 RUN mkdir -p /mattermost/data /mattermost/plugins /mattermost/client/plugins \
-  && if [ ! -z "$MM_PACKAGE" ]; then curl $MM_PACKAGE | tar -xvz ; \
-  else echo "please set the MM_PACKAGE" ; fi \
-  && addgroup -g ${PGID} mattermost \
-  && adduser -D -u ${PUID} -G mattermost -h /mattermost -D mattermost \
-  && chown -R mattermost:mattermost /mattermost /mattermost/plugins /mattermost/client/plugins
+    && addgroup -gid ${PGID} mattermost \
+    && adduser -q --disabled-password --uid ${PUID} --gid ${PGID} --gecos "" --home /mattermost mattermost \
+    && if [ -n "$MM_PACKAGE" ]; then curl $MM_PACKAGE | tar -xvz ; \
+    else echo "please set the MM_PACKAGE" ; exit 127 ; fi \
+    && chown -R mattermost:mattermost /mattermost /mattermost/data /mattermost/plugins /mattermost/client/plugins
 
+# We should refrain from running as privileged user
 USER mattermost
 
 #Healthcheck to make sure container is ready
 HEALTHCHECK --interval=30s --timeout=10s \
   CMD curl -f http://localhost:8065/api/v4/system/ping || exit 1
 
-
 # Configure entrypoint and command
 COPY entrypoint.sh /
 ENTRYPOINT ["/entrypoint.sh"]
@@ -48,3 +46,4 @@ EXPOSE 8065 8067 8074 8075
 
 # Declare volumes for mount point directories
 VOLUME ["/mattermost/data", "/mattermost/logs", "/mattermost/config", "/mattermost/plugins", "/mattermost/client/plugins"]
+

build/entrypoint.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 if [ "${1:0:1}" = '-' ]; then
     set -- mattermost "$@"