Add Ubuntu16.04 build dockerfile

[sxa]

Create and Ubuntu16.04 dockerfile similar to the CentOS6/7 ones so that we can continue to run these on a more secure host for the arm32 JDK8/11 builds which we currently build on Ubuntu 16.04

Approvals welcome but PLEASE LEAVE FOR ME TO MERGE ONCE i'M FULLY HAPPY WITH IT.

Checklist

• commit message has one of the standard prefixes
• FAQ.md updated if appropriate
• other documentation is changed or added (if applicable)
• playbook changes run through VPC or QPC (if you have access)
• for inventory.yml changes, bastillion/nagios/jenkins updated accordingly

NOTES:

• It looks like openjdk-7-jdk can no longer be located so I have removed that and set JDK7_BOOT_DIR to point to openjdk-8. It may have been removed from http://ppa.launchpad.net/openjdk-r/ppa/ubuntu/pool/main/o/openjdk-7/ for armhd at some point. I have a tarred up version of the openjdk-7-jdk directory from one of the current build machines so potentially it could be deployed if we decide that using JDK8 to bootstrap JDK8 is not desirable going forward.
• If we're going to put this into prodution we'll need a way to generate and distribute the image to the build systems, but putting this dockerfile in place is a first step.
• A static copy of an image created form these changes has been created with SHA256 checksum 31ddb40b03588fe36b08202bc41beaa2d4086094871d48eb641e9835e170529a (recording that for my own benefit as I have not published it anywhere)
• The uname stuff is a bit of a hack but without it the main build completes but make images fails when running on a 64-bit host.

[sxa]

Ansible Lint failure appears unrelated to this PR but will need to be investigated

[gdams]

@sxa I pushed up the jenkinsfile changes in order to build and push this dockerfile

[sxa]

@sxa I pushed up the jenkinsfile changes in order to build and push this dockerfile

If I'm reading this right you've done it for aarch64. This is being done as a requirement for armv7l which we are currently building on Ubuntu 16.04 - we should not require this build for architectures other than armv7l unless there's a different use case that you're thinking of.

[gdams]

I added a build for x64 just because it would be strange to only build an arm64 image but didn't add ppc64le

[sxa]

I added a build for x64 just because it would be strange to only build an arm64 image but didn't add ppc64le

But we only need it for arm32, not arm64 :-)

[gdams]

Haha my bad, I'll update the jenkinsfile later

[gdams]

okay @sxa that should be good now

[sxa]

Thanks. I'm going to hold off on merging for now due to another issue with the compiler that we need to think about ... (I may just think about it, procrastinate for a bit, merge it anyway, then find a better solution later)
Ref: adoptium/adoptium-support#319

[sxa]

Solaris failure does not seem related to this PR therefore merging. Have raised #2226 to investigate.
This has now been deployed for:

• https://ci.adoptopenjdk.net/computer/build-equinix-ubuntu1604-armv7l-1 (eMag) JDK build [680]((https://ci.adoptopenjdk.net/job/build-scripts/job/jobs/job/jdk8u/job/jdk8u-linux-arm-hotspot/680/) (23m) and (https://ci.adoptopenjdk.net/job/build-scripts/job/jobs/job/jdk8u/job/jdk8u-linux-arm-hotspot/682)) (12m)
• https://ci.adoptopenjdk.net/computer/build-equinix-ubuntu1604-armv7l-2 (Altra) JDK8 build 681 (13m)
• By comparison the pi4 systems build in about 33 minutes, and the scaleway machines were about 1h45. The docker container builds on the aarch64 hosts will likely become faster once Allow building of arm32 target on aarch64 kernels with default 32-bit userspace (and use >4 cores) temurin-build#2662 goes in to deresrict it from only using four cores.

For reference. JDK17/arm32 on the Altra takes about 11 minutes to perform the build phase, and 7 minutes with a populated ccache.