Run tests Docker in Docker (#261)

* Try running tests in Docker

* Spawn new container for each test

* Store test artifacts outside of mount

* When requested, build up to date image in test script

* sudo is unneccessary in containerized test env

* Skip azure test

* Backdate fixture file in JSON database

* Pin versions for azure tools

* Mount temp volume for /var/lib/docker to prevent dangling ones created by VOLUME instruction

* Fail backdating tests with message

* Add some documentation on test setup

* Cache images

* Run compose stacks with shortened default timeout

test/user/docker-compose.yml

@@ -10,7 +10,6 @@ services:
       - docker-volume-backup.archive-pre.user=testuser
       - docker-volume-backup.archive-pre=/bin/sh -c 'whoami > /tmp/whoami.txt'
 
-
   backup:
     image: offen/docker-volume-backup:${TEST_VERSION:-canary}
     deploy:
@@ -21,10 +20,10 @@ services:
       BACKUP_CRON_EXPRESSION: 0 0 5 31 2 ?
       EXEC_FORWARD_OUTPUT: "true"
     volumes:
-      - ./local:/archive
+      - ${LOCAL_DIR:-./local}:/archive
       - app_data:/backup/data:ro
       - /var/run/docker.sock:/var/run/docker.sock
 
 volumes:
   app_data:
-  archive:
+  archive: