Bug 1380531 - Write initial CircleCI configuration for BMO

This is the first (working) iteration of a configuration that allows
CircleCI to build 'bmo' docker images that are runnable.

Some other changes were required for this:

1. The base image used in Dockerfile was changed from centos:6.7 to
   mozillabteam/bmo-base:slim.
   This is a new version of (github) mozilla-bteam/docker-bmo-base
   which is much smaller, and includes all the system RPMs and other
   bits that our bmo Dockerfile expects.
2. init.pl mistakenly had '--no-assets' which is not currently a checksetup.pl
   option.
3. 901-secure-mail-loop.t (which checks for an infinite loop) had
   to have its timeout increased because CircleCI sometimes is quite slow.
4. version.txt // __version__ now includes build information from CircleCI
   environmental variables

1 files changed, 6 insertions, 3 deletions

diff --git a/extensions/BMO/Extension.pm b/extensions/BMO/Extension.pm
index 0f63ffbb4..cb1996cbc 100644
--- a/extensions/BMO/Extension.pm
+++ b/extensions/BMO/Extension.pm
@@ -2544,8 +2544,11 @@ sub install_filesystem {
     my $contribute = eval {
         $json->decode(scalar read_file(bz_locations()->{cgi_path} . "/contribute.json"));
     };
-    my $commit = `git rev-parse HEAD`;
-    chomp $commit;
+    my $commit = $ENV{CIRCLE_SHA1};
+    unless ($commit) {
+        $commit = `git rev-parse HEAD`;
+        chomp $commit;
+    }
 
     if (!$contribute) {
         die "Missing or invalid contribute.json file";
@@ -2555,7 +2558,7 @@ sub install_filesystem {
         source  => $contribute->{repository}{url},
         version => BUGZILLA_VERSION,
         commit  => $commit // "unknown",
-        build   => $ENV{BUGZILLA_CI_BUILD} // "unknown",
+        build   => $ENV{CIRCLE_BUILD_NUM} // "unknown",
     };
 
     $create_files->{'version.json'} = {