timestamp gitlab ci job outputs

Based on previous work by @alvicsam in #13047.

.gitlab-ci.yml

@@ -110,9 +110,14 @@ variables:
   before_script:
     - if echo "$CI_DISABLED_JOBS" | grep -xF "$CI_JOB_NAME"; then echo "The job has been cancelled in CI settings"; exit 0; fi
 
+.timestamp:
+  before_script:
+    - source scripts/ci/gitlab/timestamp.sh
+
 .kubernetes-env:
   image: "${CI_IMAGE}"
   before_script:
+    - !reference [.timestamp, before_script]
     - !reference [.job-switcher, before_script]
     - !reference [.prepare-env, before_script]
   tags:
@@ -141,6 +146,7 @@ variables:
 .docker-env:
   image: "${CI_IMAGE}"
   before_script:
+    - !reference [.timestamp, before_script]
     - !reference [.job-switcher, before_script]
     - !reference [.prepare-env, before_script]
     - !reference [.rust-info-script, script]

scripts/ci/gitlab/timestamp.sh

@@ -0,0 +1,21 @@
+# https://gist.github.com/altaua/477285db40181ef1793bbed5bae32c6b
+# based on https://gist.github.com/jstine35/e0fc0e06ec06d74bc3ebd67585bf2a1d
+
+s_datestamp() {
+  TZ=UTC
+  eof=""
+  while [[ -z "${eof}" ]]; do
+    IFS="" read -r line || eof=1
+    printf '[%(%F %T)T] %s\n' -1 "${line}"
+  done
+}
+
+cleanup() {
+  exec >/dev/null 2>&1
+  wait "${TIMESTAMP_PID}"
+}
+
+exec > >(s_datestamp) 2>&1
+
+TIMESTAMP_PID=$!
+trap cleanup EXIT