Add proper Architectures entries in "generate-stackbrew-library.sh"

[tianon]

This depends on #166 (since the erlang-solutions repository has a very limited set of architectures supported compared to Debian).

See also docker-library/buildpack-deps#59, docker-library/golang#163, docker-library/docker#63, docker-library/gcc#36, jessfraz/irssi#15, redis/docker-library-redis#95, docker-library/openjdk#121, docker-library/postgres#298, docker-library/haproxy#41, docker-library/httpd#55, docker-library/memcached#19, docker-library/tomcat#73, docker-library/ruby#133, docker-library/python#206, docker-library/php#454, docker-library/wordpress#223.

[tianon]

$ diff -u <(bashbrew cat rabbitmq) <(bashbrew cat <(./generate-stackbrew-library.sh))
--- /dev/fd/63	2017-06-16 16:34:25.598094189 -0700
+++ /dev/fd/62	2017-06-16 16:34:25.598094189 -0700
@@ -2,10 +2,12 @@
 GitRepo: https://github.com/docker-library/rabbitmq.git
 
 Tags: 3.6.10, 3.6, 3, latest
+Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
 GitCommit: a6cb36022a5c1a17df78cfafe45a73d941ad4eb8
 Directory: 3.6/debian
 
 Tags: 3.6.10-management, 3.6-management, 3-management, management
+Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
 GitCommit: 79277042564875d55e4b05a60c65b6eb46651a94
 Directory: 3.6/debian/management
 

[tianon]

(Will be even better once Alpine goes multiarch, especially since Alpine 3.6 supports more arches than Alpine 3.5. 😄)

[tianon]

(cancelled Travis so we don't waste cycles doing nothing)

[tianon]

Whoops: https://packages.debian.org/stretch/erlang-base-hipe#pdownload 😇

(erlang-base-hipe has a limited set of arches, so we need to make that installation conditional on whether the package is available for our current arch, especially since the usage of it is already optional 👍)

[tianon]

Ah, and our second problem: https://www.rabbitmq.com/debian/dists/testing/Release (Architectures: AVR32 alpha amd64 arm armel armhf hppa hurd-i386 i386 ia64 kfreebsd-amd64 kfreebsd-i386 m32 m68k mips mipsel netbsd-alpha netbsd-i386 powerpc s390 s390x sh sparc)

The package itself is arch:all, but ppc64el isn't included in this list, so our ppc64le build server won't find the package. 😅

@michaelklishin how feasible do you think it'd be to have whoever maintains that repository add ppc64el too? (it doesn't require a .deb rebuild, simply extra metadata to tell ppc64el where to find the existing arch:all .deb file 😇) If there's a "proper" place to file that, I'm happy to file the issue/request myself too. 👍

[tianon]

I'm really good at looking closely -- appears to be missing arm64 too (but armhf, i386, and s390x built successfully!)

[tianon]

Found the right place to file a PR for that Architectures list! 😇 (rabbitmq/rabbitmq-server-release#47)