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, 25 insertions, 0 deletions

diff --git a/.circleci/config.yml b/.circleci/config.yml
new file mode 100644
index 000000000..18d282917
--- /dev/null
+++ b/.circleci/config.yml
@@ -0,0 +1,25 @@
+# References:
+# 1. https://circleci.com/blog/how-to-build-a-docker-image-on-circleci-2-0/
+# 2. https://circleci.com/docs/2.0/building-docker-images/
+#
+
+version: 2
+jobs:
+  build:
+    working_directory: /app
+    docker:
+      - image: docker:17.06.1-ce
+        environment:
+          BMO_IMAGE_NAME: mozillabteam/bmo
+    steps:
+      - setup_remote_docker
+      - run:
+          name: install git and ssh
+          command: apk update && apk add git openssh-client
+      - checkout
+      - run: |
+          docker build -t $BMO_IMAGE_NAME:$CIRCLE_BRANCH .
+          if [[ -n "$DOCKER_USER" && -n "$DOCKER_PASS" ]]; then
+            docker login -u "$DOCKER_USER" -p "$DOCKER_PASS"
+            docker push $BMO_IMAGE_NAME:$CIRCLE_BRANCH
+          fi