[8.9](backport #36193) [Heartbeat] Add default TZ to heartbeat docker…

… images (#36239)

This is an automatic backport of pull request #36193 done by
[Mergify](https://mergify.com).


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Co-authored-by: Emilio Alvarez Piñeiro <95703246+emilioalvap@users.noreply.github.com>

CHANGELOG.next.asciidoc

@@ -95,6 +95,33 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 *Heartbeat*
 
 - Fix panics when parsing dereferencing invalid parsed url. {pull}34702[34702]
+- Fix broken zip URL monitors. NOTE: Zip URL Monitors will be removed in version 8.7 and replaced with project monitors. {pull}33723[33723]
+- Fix integration hashing to prevent reloading all when updated. {pull}34697[34697]
+- Fix release of job limit semaphore when context is cancelled. {pull}34697[34697]
+- Fix bug where states.duration_ms was incorrect type. {pull}33563[33563]
+- Fix handling of long UDP messages in UDP input. {issue}33836[33836] {pull}33837[33837]
+- Fix browser monitor summary reporting as up when monitor is down. {issue}33374[33374] {pull}33819[33819]
+- Fix beat capabilities on Docker image. {pull}33584[33584]
+- Fix serialization of state duration to avoid scientific notation. {pull}34280[34280]
+- Enable nodejs engine strict validation when bundling synthetics. {pull}34470[34470]
+with the ecs field name `container`. {pull}34403[34403]
+automatic splitting at root level, if root level element is an array. {pull}34155[34155]
+- Fix broken mapping for state.ends field. {pull}34891[34891]
+- Fix issue using projects in airgapped environments by disabling npm audit. {pull}34936[34936]
+- Fix broken state ID location naming. {pull}35336[35336]
+- Fix project monitor temp directories permission to include group access. {pull}35398[35398]
+- Fix output pipeline exit on run_once. {pull}35376[35376]
+- Fix formatting issue with socket trace timeout. {pull}35434[35434]
+- Update gval version. {pull}35636[35636]
+- Fix serialization of processors when running diagnostics. {pull}35698[35698]
+- Filter dev flags for ui monitors inside synthetics_args. {pull}35788[35788]
+- Fix temp dir running out of space with project monitors. {issue}35843[35843]
+- Fixing the grok expression outputs of log files {pull}35221[35221]
+- Enable heartbeat-wide publish timeout setting with run_once. {pull}35721[35721]
+- Added default timezone UTC to heartbeat docker images to fix synthetics journeys navigation errors. {pull}36193[36193]
+
+*Heartbeat*
+
 
 *Heartbeat*
 

dev-tools/packaging/templates/docker/Dockerfile.tmpl

@@ -121,6 +121,7 @@ RUN echo \
 
 # Setup synthetics env vars
 ENV ELASTIC_SYNTHETICS_CAPABLE=true
+ENV TZ=UTC
 ENV SUITES_DIR={{ $beatHome }}/suites
 ENV NODE_VERSION=18.16.0
 ENV PATH="$NODE_PATH/node/bin:$PATH"