Record the output from loading new revisions to the database

So that it can easily be shown through the web interface. There's two tables
being used. One which temporarily stores the output as it's output while the
job is running, and other which stores the whole log once the job has
finished.

sqitch/deploy/load_new_guix_revision_job_logs.sql

@@ -0,0 +1,16 @@
+-- Deploy guix-data-service:load_new_guix_revision_job_logs to pg
+
+BEGIN;
+
+CREATE TABLE load_new_guix_revision_job_log_parts (
+    id integer NOT NULL,
+    job_id integer NOT NULL,
+    contents text NOT NULL
+);
+
+CREATE TABLE load_new_guix_revision_job_logs (
+    job_id integer PRIMARY KEY REFERENCES load_new_guix_revision_jobs (id),
+    contents text NOT NULL
+);
+
+COMMIT;

sqitch/revert/load_new_guix_revision_job_logs.sql

@@ -0,0 +1,8 @@
+-- Revert guix-data-service:load_new_guix_revision_job_logs from pg
+
+BEGIN;
+
+DROP TABLE load_new_guix_revision_job_log_parts;
+DROP TABLE load_new_guix_revision_job_logs;
+
+COMMIT;

sqitch/sqitch.plan

@@ -13,3 +13,4 @@ add_git_repositories_cgit_url_base 2019-05-13T18:45:14Z Christopher Baines <mail
 license_support 2019-05-13T20:37:40Z Christopher Baines <mail@cbaines.net> # Add support for storing license information
 dates_to_load_new_guix_revision_jobs 2019-06-02T07:39:49Z Christopher Baines <mail@cbaines.net> # Add dates to the load_new_guix_revision_jobs table
 load_new_guix_revision_job_events 2019-06-02T15:44:41Z Christopher Baines <mail@cbaines.net> # Add new table for guix_revision_job_events
+load_new_guix_revision_job_logs 2019-06-21T14:33:09Z chris <chris@phact> # Add load_new_guix_revision_job_logs

sqitch/verify/load_new_guix_revision_job_logs.sql

@@ -0,0 +1,7 @@
+-- Verify guix-data-service:load_new_guix_revision_job_logs on pg
+
+BEGIN;
+
+-- XXX Add verifications here.
+
+ROLLBACK;