Annotate CI config file.

[skip ci]

.circleci/config.yml

@@ -3,12 +3,16 @@ jobs:
   build:
     working_directory: ~/syme
     docker:
+      # Since we include lein in the repo, all we need is a JDK.
       - image: openjdk:8
       - image: postgres:9.4.1
+        # The official Postgres docker images will create your DB for you
+        # if you set the POSTGRES_DB environment variable.
         environment:
           POSTGRES_USER: root
           POSTGRES_DB: syme
     environment:
+      # Suppress warnings by setting LEIN_ROOT.
       LEIN_ROOT=nbd
       DATABASE_URL=postgres://localhost/syme
     steps:
@@ -22,14 +26,14 @@ jobs:
             - $HOME/.m2
             - $HOME/.lein
           key: << checksum "project.clj" >>
-      # Migrate the DB, then test
+      # Migrate the DB, then test.
       - run: bin/lein do run -m syme.db, test
-      # Push it out to Heroku on a successful master build
+      # Push it out to Heroku on a successful master build.
       - add_ssh_keys
       - deploy:
           command: |
               if [ "${CIRCLE_BRANCH}" == "master" ]; then
-                # Install Heroku fingerprint
+                # Install Heroku SSH server fingerprint.
                 mkdir -p ~/.ssh
                 echo 'heroku.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAu8erSx6jh+8ztsfHwkNeFr/SZaSOcvoa8AyMpaerGIPZDB2TKNgNkMSYTLYGDK2ivsqXopo2W7dpQRBIVF80q9mNXy5tbt1WE04gbOBB26Wn2hF4bk3Tu+BNMFbvMjPbkVlC2hcFuQJdH4T2i/dtauyTpJbD/6ExHR9XYVhdhdMs0JsjP/Q5FNoWh2ff9YbZVpDQSTPvusUp4liLjPfa/i0t+2LpNCeWy8Y+V9gUlDWiyYwrfMVI0UwNCZZKHs1Unpc11/4HLitQRtvuk0Ot5qwwBxbmtvCDKZvj1aFBid71/mYdGRPYZMIxq1zgP1acePC1zfTG/lvuQ7d0Pe0kaw==' >> ~/.ssh/known_hosts