OPENJDK-2408: binary build with custom s2i assemble script

A variant of spring-boot-sample-simple/target, i.e. a pre-built JAR
to provoke the s2i assemble script's "binary" path, with an added
.s2i/bin/assemble script which is invoked by s2i instead of the
builder image's assemble script.

This script simply ensures there's a minimum of a one second interval
between the start of the s2i process (after the application source has
been copied into the s2i container) and the invocation of the builder
image's assemble script.

This ensures that, if the builder image script does not preserve the
modified timestamp of the binary, the time delta is at least one second.

Signed-off-by: Jonathan Dowland <[email protected]>

Author: jmtd

OPENJDK-2408-bin-custom-s2i-assemble/.s2i/bin/assemble

@@ -0,0 +1,11 @@
+#!/bin/bash
+set -euo pipefail
+
+# we put a sleep here to ensure that there's at least a one second difference
+# between the ctime of the app source (copied in by s2i) and any artefacts
+# created by the build/assemble.
+echo appsrc-provided s2i assemble script executed
+sleep 1
+echo delegating to builder image s2i assemble
+
+exec /usr/local/s2i/assemble "$@"