inline timestamp script

Some of our jobs don't check out the substrate repo.

.gitlab-ci.yml

@@ -110,10 +110,6 @@ 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:
@@ -316,6 +312,7 @@ include:
   - local: scripts/ci/gitlab/default-pipeline.yml
     rules:
       - if: $PIPELINE != "automatic-crate-publishing"
+  - scripts/ci/gitlab/timestamp.yml
 
 #### stage:                        notify
 

scripts/ci/gitlab/timestamp.yml

@@ -0,0 +1,27 @@
+.timestamp:
+  before_script:
+    - |
+      echo "Install timestamp handler"
+      eval '
+        # 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
+      '