CLD-5698 - Add e2e smoketests (#23590)

* Prepare: run E2E smoketests with GitHub actions (#23301)
* Port E2E testing scripts from cypress-ui-automation
* Move server to docker-compose, move E2E images to ecrpublic
* Integrate General channel renaming, fixes
* Add local automation-dashboard
 Add readme
* Add E2E smoketests
* Bump postgres to 12
* Fully rely on mattermostdevelopment images

---------

Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: Saturnino Abril <saturnino.abril@gmail.com>
Co-authored-by: Antonis Stamatiou <stamatiou.antonis@gmail.com>

e2e-tests/.ci/server.prepare.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+set -e -u -o pipefail
+cd $(dirname $0)
+. .e2erc
+
+# Install cypress dependencies
+mme2e_log "Prepare Cypress: install dependencies"
+${MME2E_DC_SERVER} exec -T -u 0 -- cypress bash -c "id $MME2E_UID || useradd -u $MME2E_UID -m nodeci" # Works around the node image's assumption that the app files are owned by user 1000
+${MME2E_DC_SERVER} exec -T -u $MME2E_UID -- cypress npm i
+${MME2E_DC_SERVER} exec -T -u $MME2E_UID -- cypress cypress install
+
+# Populate cypress fixtures
+mme2e_log "Prepare Cypress: populating fixtures"
+${MME2E_DC_SERVER} exec -T -- server curl -L --silent https://github.com/mattermost/mattermost-plugin-gitlab/releases/download/v1.3.0/com.github.manland.mattermost-plugin-gitlab-1.3.0.tar.gz | ${MME2E_DC_SERVER} exec -T -u $MME2E_UID -- cypress tee tests/fixtures/com.github.manland.mattermost-plugin-gitlab-1.3.0.tar.gz >/dev/null
+${MME2E_DC_SERVER} exec -T -- server curl -L --silent https://github.com/mattermost/mattermost-plugin-demo/releases/download/v0.9.0/com.mattermost.demo-plugin-0.9.0.tar.gz | ${MME2E_DC_SERVER} exec -T -u $MME2E_UID -- cypress tee tests/fixtures/com.mattermost.demo-plugin-0.9.0.tar.gz >/dev/null
+${MME2E_DC_SERVER} exec -T -- server curl -L --silent https://github.com/mattermost/mattermost-plugin-demo/releases/download/v0.8.0/com.mattermost.demo-plugin-0.8.0.tar.gz | ${MME2E_DC_SERVER} exec -T -u $MME2E_UID -- cypress tee tests/fixtures/com.mattermost.demo-plugin-0.8.0.tar.gz >/dev/null
+${MME2E_DC_SERVER} exec -T -- server curl -L --silent https://github.com/mattermost/mattermost-plugin-demo/releases/download/v0.8.0/com.mattermost.demo-plugin-0.8.0.tar.gz | ${MME2E_DC_SERVER} exec -T -u $MME2E_UID -- cypress tee tests/fixtures/com.mattermost.demo-plugin-0.8.0.tar.gz >/dev/null
+${MME2E_DC_SERVER} exec -T -u $MME2E_UID -- cypress tee tests/fixtures/keycloak.crt >/dev/null <../../server/build/docker/keycloak/keycloak.crt
+
+# Inject test data, prepare for E2E tests
+mme2e_log "Prepare Server: injecting E2E test data"
+${MME2E_DC_SERVER} exec -T -- server mmctl config set TeamSettings.MaxUsersPerTeam 100 --local
+${MME2E_DC_SERVER} exec -T -- server mmctl sampledata -u 60 --local
+${MME2E_DC_SERVER} exec -T -- openldap bash -c 'ldapadd -x -D "cn=admin,dc=mm,dc=test,dc=com" -w mostest' <../../server/tests/test-data.ldif
+${MME2E_DC_SERVER} exec -T -- minio sh -c 'mkdir -p /data/mattermost-test'
+mme2e_log "Mattermost is running and ready for E2E testing"
+mme2e_log "You can use the test data credentials for logging in (username=sysadmin password=Sys@dmin-sample1)"